YEAR MONTH MEAN STDEV COUNT 2000 1 nan nan 0 2000 2 2.46204e+01 4.59686e-01 149 2000 3 2.47553e+01 5.29858e-01 480 2000 4 2.52144e+01 6.56708e-01 640 2000 5 2.63613e+01 1.77625e+00 398 2000 6 2.80627e+01 8.88580e-01 548 2000 7 2.93842e+01 7.66907e-01 575 2000 8 2.93769e+01 7.42078e-01 330 2000 9 2.89806e+01 1.15258e+00 448 2000 10 2.79768e+01 1.40948e+00 302 2000 11 2.59877e+01 1.25734e+00 358 2000 12 2.48175e+01 5.91017e-01 273 2001 1 2.33160e+01 1.02807e+00 612 2001 2 2.37541e+01 7.45450e-01 536 2001 3 2.38193e+01 8.89681e-01 683 2001 4 2.55895e+01 5.82769e-01 799 2001 5 2.59724e+01 1.01333e+00 444 2001 6 2.81848e+01 7.34873e-01 406 2001 7 2.82607e+01 1.59680e+00 459 2001 8 2.90950e+01 8.02080e-01 651 2001 9 2.88914e+01 9.70783e-01 224 2001 10 2.72420e+01 1.57672e+00 283 2001 11 2.63075e+01 8.21126e-01 368 2001 12 2.51216e+01 6.90033e-01 532 2002 1 2.37366e+01 6.76902e-01 706 2002 2 2.36435e+01 3.03851e-01 157 2002 3 2.54786e+01 1.59237e+00 431 2002 4 2.65849e+01 9.74191e-01 559 2002 5 2.68694e+01 1.38823e+00 668 2002 6 2.68492e+01 2.15955e+00 229 2002 7 2.89761e+01 8.98003e-01 2063 2002 8 2.94508e+01 8.98680e-01 1733 2002 9 2.85275e+01 1.20679e+00 1949 2002 10 2.81294e+01 6.20078e-01 3259 2002 11 2.70767e+01 1.20725e+00 2227 2002 12 2.49972e+01 1.13749e+00 1873 2003 1 2.33673e+01 1.05040e+00 2505 2003 2 2.30799e+01 9.23756e-01 2542 2003 3 2.53845e+01 1.08924e+00 2258 2003 4 2.54583e+01 8.54104e-01 2257 2003 5 2.74448e+01 1.02254e+00 2628 2003 6 2.81626e+01 1.10260e+00 1190 2003 7 2.87436e+01 9.14000e-01 1813 2003 8 2.99246e+01 9.76684e-01 1642 2003 9 2.91509e+01 6.02125e-01 1849 2003 10 2.83723e+01 9.72381e-01 2549 2003 11 2.69229e+01 8.42901e-01 1755 2003 12 2.45853e+01 1.36599e+00 1234 2004 1 2.49268e+01 8.37885e-01 2245 2004 2 2.37656e+01 9.07685e-01 2053 2004 3 2.48872e+01 1.11717e+00 1583 2004 4 2.46953e+01 9.38637e-01 2695 2004 5 2.61124e+01 9.86893e-01 3299 2004 6 2.87382e+01 8.80528e-01 2878 2004 7 2.95903e+01 1.14568e+00 2225 2004 8 3.02460e+01 1.06724e+00 1267 2004 9 2.86920e+01 1.03481e+00 1919 2004 10 2.78666e+01 7.50314e-01 2204 2004 11 2.66091e+01 1.08059e+00 2205 2004 12 2.52583e+01 1.13822e+00 1516 2005 1 2.40754e+01 8.63817e-01 2830 2005 2 2.36710e+01 8.89554e-01 1690 2005 3 2.38112e+01 9.30030e-01 2586 2005 4 2.42338e+01 8.97384e-01 2833 2005 5 2.59069e+01 1.40541e+00 2556 2005 6 2.80836e+01 9.59204e-01 1455 2005 7 2.91434e+01 8.22292e-01 2642 2005 8 2.98218e+01 1.43343e+00 2743 2005 9 2.94718e+01 1.02609e+00 1721 2005 10 2.74814e+01 1.05834e+00 1513 2005 11 2.58241e+01 7.55017e-01 2756 2005 12 2.44360e+01 1.03437e+00 2456 2006 1 2.34495e+01 7.40836e-01 1866 2006 2 2.37099e+01 8.49205e-01 2321 2006 3 2.47083e+01 8.75998e-01 2990 2006 4 2.56940e+01 1.08363e+00 2953 2006 5 2.68397e+01 9.49771e-01 2796 2006 6 2.83081e+01 7.64332e-01 2028 2006 7 2.89344e+01 1.03278e+00 1428 2006 8 2.96169e+01 7.45731e-01 1760 2006 9 3.02031e+01 7.67721e-01 2187 2006 10 2.85759e+01 9.11014e-01 2342 2006 11 2.61467e+01 1.16943e+00 1845 2006 12 2.49767e+01 1.30071e+00 1331 2007 1 2.48100e+01 1.02103e+00 2077 2007 2 2.40082e+01 1.08195e+00 1624 2007 3 2.43291e+01 9.72679e-01 1828 2007 4 2.50898e+01 1.04544e+00 2997 2007 5 2.66606e+01 9.55461e-01 2424 2007 6 2.78411e+01 1.37198e+00 1682 2007 7 2.98816e+01 7.42387e-01 2460 2007 8 2.97964e+01 9.36476e-01 2789 2007 9 2.97364e+01 8.35281e-01 1660 2007 10 2.80735e+01 7.12617e-01 1500 2007 11 2.64309e+01 9.05872e-01 2751 2007 12 2.53861e+01 7.72708e-01 2472 2008 1 2.41185e+01 8.23161e-01 2227 2008 2 2.44884e+01 1.10194e+00 2085 2008 3 2.40942e+01 8.14262e-01 1891 2008 4 2.55251e+01 8.20192e-01 3149 2008 5 2.68311e+01 1.12656e+00 3475 2008 6 2.80283e+01 1.03607e+00 2136 2008 7 2.91770e+01 1.01148e+00 1906 2008 8 2.97083e+01 1.09710e+00 2067 2008 9 2.82328e+01 8.15920e-01 2021 2008 10 2.81679e+01 9.69808e-01 1452 2008 11 2.56870e+01 8.47635e-01 2267 2008 12 2.40749e+01 1.24007e+00 2103 2009 1 2.32733e+01 1.06425e+00 2455 2009 2 2.32059e+01 8.93782e-01 2143 2009 3 2.35190e+01 1.21868e+00 2284 2009 4 2.48989e+01 7.63737e-01 2886 2009 5 2.64507e+01 1.02055e+00 2850 2009 6 2.89285e+01 1.08945e+00 2072 2009 7 2.93196e+01 1.07853e+00 1947 2009 8 2.99365e+01 8.29097e-01 2643 2009 9 2.99194e+01 7.28810e-01 1301 2009 10 2.91575e+01 1.06854e+00 2815 2009 11 2.72537e+01 9.48345e-01 2052 2009 12 2.56386e+01 8.10395e-01 1632 2010 1 2.40078e+01 1.24161e+00 1778 2010 2 2.30876e+01 1.08660e+00 1442 2010 3 2.21553e+01 9.00517e-01 2092 2010 4 2.40587e+01 1.10309e+00 2200 2010 5 2.69580e+01 1.14076e+00 2978 2010 6 2.96180e+01 1.06830e+00 2921 2010 7 2.88299e+01 1.76355e+00 1706 2010 8 3.00222e+01 1.18472e+00 1911 2010 9 2.92881e+01 8.80819e-01 2314 2010 10 2.78296e+01 9.82097e-01 2662 2010 11 2.63653e+01 1.14910e+00 2258 2010 12 2.44168e+01 1.40270e+00 3149 2011 1 2.27897e+01 1.31010e+00 2204 2011 2 2.26562e+01 8.17570e-01 2603 2011 3 2.46822e+01 9.41312e-01 3022 2011 4 2.58295e+01 7.42971e-01 3200 2011 5 2.70598e+01 7.09522e-01 3238 2011 6 2.83317e+01 1.18794e+00 2217 2011 7 2.94995e+01 1.08102e+00 2434 2011 8 3.01312e+01 1.04553e+00 1814 2011 9 2.97176e+01 1.06195e+00 2241 2011 10 2.85504e+01 1.22206e+00 1355 2011 11 2.58275e+01 7.84498e-01 2201 2011 12 2.46811e+01 9.40320e-01 2456 2012 1 2.37627e+01 1.04004e+00 1714 2012 2 2.44380e+01 7.55609e-01 1735 2012 3 2.47669e+01 8.92187e-01 2670 2012 4 2.58516e+01 1.02992e+00 2262 2012 5 2.66055e+01 1.11145e+00 1777 2012 6 2.81209e+01 1.12432e+00 1643 2012 7 2.86074e+01 8.06433e-01 2310 2012 8 2.93746e+01 1.29429e+00 1918 2012 9 2.89682e+01 1.02839e+00 1761 2012 10 2.81056e+01 9.33466e-01 2512 2012 11 2.72324e+01 9.90047e-01 2389 2012 12 2.56007e+01 1.05846e+00 1984 2013 1 2.43584e+01 9.17698e-01 2134 2013 2 2.42819e+01 8.89203e-01 2184 2013 3 2.41349e+01 1.06065e+00 2126 2013 4 2.55491e+01 1.30697e+00 2275 2013 5 2.66355e+01 6.85777e-01 2590 2013 6 2.79911e+01 6.51921e-01 1607 2013 7 2.88021e+01 1.07386e+00 1862 2013 8 2.91559e+01 1.06386e+00 2027 2013 9 2.91928e+01 5.80573e-01 1772 2013 10 2.82837e+01 1.05301e+00 2667 2013 11 2.71572e+01 8.40954e-01 1733 2013 12 2.58129e+01 8.17897e-01 2115 2014 1 2.52725e+01 1.11231e+00 2017 2014 2 2.52956e+01 9.48436e-01 2886 2014 3 2.47478e+01 1.04111e+00 2704 2014 4 2.59549e+01 9.63970e-01 2214 2014 5 2.65851e+01 8.05215e-01 2059 2014 6 2.84970e+01 1.29443e+00 1976 2014 7 2.96623e+01 9.54451e-01 2152 2014 8 3.05328e+01 9.94831e-01 3261 2014 9 2.96946e+01 1.01061e+00 1376 2014 10 2.84198e+01 1.16811e+00 2607 2014 11 2.61292e+01 1.07587e+00 2634 2014 12 2.55689e+01 9.28650e-01 1733 2015 1 2.50028e+01 7.39182e-01 1887 2015 2 2.41027e+01 1.35837e+00 2274 2015 3 2.49848e+01 1.04472e+00 3021 2015 4 2.65052e+01 1.26414e+00 2789 2015 5 2.71269e+01 9.75681e-01 3119 2015 6 2.88483e+01 9.29794e-01 1832 2015 7 2.97917e+01 1.09485e+00 2195 2015 8 3.02726e+01 1.24435e+00 2042 2015 9 2.98731e+01 1.30583e+00 1605 2015 10 2.85907e+01 1.17203e+00 2008 2015 11 2.76127e+01 8.45721e-01 2245 2015 12 2.55916e+01 6.59352e-01 1655 2016 1 2.55423e+01 9.53270e-01 1112 2016 2 2.50336e+01 1.27628e+00 1608 2016 3 2.44367e+01 1.21507e+00 1175 2016 4 2.59676e+01 9.03295e-01 2676 2016 5 2.74413e+01 1.13185e+00 2728 2016 6 2.88425e+01 8.57051e-01 2343 2016 7 2.97151e+01 7.27795e-01 2827 2016 8 3.02955e+01 1.03158e+00 1757 2016 9 2.96984e+01 1.14472e+00 2443 2016 10 2.89474e+01 6.34127e-01 1517 2016 11 2.70525e+01 1.03754e+00 1860 2016 12 2.59856e+01 8.74988e-01 1937 2017 1 2.51974e+01 8.40463e-01 2395 2017 2 2.44156e+01 8.70274e-01 2578 2017 3 2.50761e+01 1.00908e+00 2710 2017 4 2.58379e+01 8.51084e-01 1827 2017 5 2.69338e+01 1.15186e+00 3046 2017 6 2.85427e+01 1.46428e+00 1207 2017 7 2.95604e+01 8.06652e-01 2395 2017 8 3.01546e+01 1.07886e+00 2567 2017 9 2.95914e+01 9.49922e-01 2880 2017 10 2.85755e+01 8.18375e-01 1803 2017 11 2.66024e+01 7.34351e-01 2946 2017 12 2.58638e+01 1.07607e+00 3359 2018 1 2.43317e+01 1.24011e+00 1346 2018 2 2.45075e+01 1.12100e+00 2477 2018 3 2.54031e+01 1.01073e+00 3394 2018 4 2.56858e+01 9.22466e-01 2863 2018 5 2.56244e+01 1.41580e+00 957 2018 6 2.86382e+01 1.06403e+00 1619 2018 7 3.01440e+01 9.86471e-01 2159 2018 8 2.98960e+01 6.44320e-01 2917 2018 9 2.97147e+01 8.88623e-01 2259 2018 10 2.81854e+01 6.92411e-01 3102 2018 11 2.72905e+01 8.47277e-01 2208 2018 12 2.54860e+01 1.28225e+00 2155 2019 1 2.50524e+01 9.27369e-01 2405 2019 2 2.51123e+01 9.50187e-01 2641 2019 3 2.58838e+01 1.02933e+00 2656 2019 4 2.59342e+01 7.98015e-01 3022 2019 5 2.71836e+01 1.05407e+00 3002 2019 6 2.97097e+01 1.35760e+00 2266 2019 7 2.99467e+01 9.35336e-01 1886 2019 8 3.02572e+01 1.32399e+00 2092 2019 9 2.92935e+01 1.06513e+00 2375 2019 10 2.85383e+01 7.35760e-01 2355 2019 11 2.78946e+01 9.15883e-01 2632 2019 12 2.58453e+01 9.21471e-01 1881 2020 1 2.52823e+01 9.96755e-01 2520 2020 2 2.55118e+01 1.49185e+00 1878 2020 3 2.52190e+01 8.44882e-01 3280 2020 4 2.67248e+01 7.88928e-01 2441 2020 5 2.71927e+01 1.00372e+00 2143 2020 6 2.91829e+01 1.00821e+00 1543 2020 7 2.96977e+01 1.14894e+00 2042 2020 8 3.01889e+01 1.07025e+00 2628 2020 9 2.97614e+01 8.85062e-01 1850 2020 10 2.86269e+01 1.35147e+00 2016 2020 11 2.68546e+01 8.08325e-01 1645 2020 12 2.59065e+01 1.31455e+00 1952 2021 1 2.40172e+01 1.26135e+00 2329 2021 2 2.43538e+01 1.03046e+00 2648 2021 3 2.49431e+01 1.10599e+00 2719 2021 4 2.57326e+01 8.54940e-01 2682 2021 5 2.72386e+01 8.39887e-01 2342 2021 6 2.77247e+01 1.08249e+00 1193 2021 7 2.94359e+01 1.02639e+00 2263 2021 8 3.00485e+01 8.13665e-01 2294 2021 9 2.98075e+01 8.95621e-01 2419 2021 10 2.88295e+01 8.05988e-01 2444 2021 11 2.67168e+01 6.45080e-01 1898 2021 12 2.58656e+01 1.05711e+00 2811 2022 1 2.52211e+01 7.07776e-01 2297 2022 2 2.46337e+01 1.09599e+00 2169 2022 3 2.56232e+01 7.93854e-01 3067 2022 4 2.61754e+01 1.16440e+00 1371 2022 5 2.73546e+01 9.41343e-01 2746 2022 6 2.89381e+01 1.00828e+00 2183 2022 7 2.97384e+01 8.41263e-01 2860 2022 8 3.01868e+01 9.16433e-01 2616 2022 9 3.06311e+01 1.04131e+00 2142 2022 10 2.78817e+01 8.36392e-01 2390 2022 11 2.73594e+01 6.28119e-01 2660 2022 12 2.61716e+01 8.20005e-01 2093 2023 1 2.52242e+01 9.16470e-01 3090 2023 2 2.52487e+01 1.01637e+00 3010 2023 3 2.54911e+01 1.00795e+00 2391 2023 4 2.64517e+01 9.15787e-01 2123 2023 5 2.77136e+01 9.42030e-01 2652 2023 6 2.92818e+01 8.29180e-01 2301 2023 7 3.11246e+01 1.09530e+00 1852 2023 8 3.09758e+01 8.06943e-01 2426 2023 9 3.03179e+01 1.08545e+00 2330 2023 10 2.91338e+01 1.21107e+00 2299 2023 11 2.74442e+01 7.14955e-01 2125 2023 12 2.59322e+01 1.10885e+00 1248 2024 1 2.53073e+01 7.08086e-01 1385 2024 2 2.41957e+01 7.01456e-01 2323 2024 3 2.51542e+01 9.94870e-01 2115 2024 4 2.50039e+01 8.07582e-01 217