YEAR MONTH MEAN STDEV COUNT 2000 1 nan nan 0 2000 2 2.44014e+01 2.97389e-01 113 2000 3 2.47327e+01 1.02109e+00 757 2000 4 2.49592e+01 9.14444e-01 789 2000 5 2.68562e+01 1.19541e+00 685 2000 6 2.79083e+01 6.68891e-01 527 2000 7 2.97579e+01 1.31751e+00 652 2000 8 2.92523e+01 1.58046e+00 274 2000 9 2.90660e+01 5.97780e-01 380 2000 10 2.78910e+01 1.15335e+00 930 2000 11 2.62418e+01 7.94966e-01 741 2000 12 2.49735e+01 5.85059e-01 500 2001 1 2.35161e+01 8.02744e-01 704 2001 2 2.36701e+01 8.63962e-01 656 2001 3 2.36728e+01 7.50160e-01 719 2001 4 2.59132e+01 1.13207e+00 578 2001 5 2.55658e+01 8.21440e-01 400 2001 6 2.76289e+01 5.96929e-01 232 2001 7 2.81131e+01 1.17791e+00 696 2001 8 2.95032e+01 1.06382e+00 242 2001 9 2.84473e+01 6.52323e-01 260 2001 10 2.78213e+01 3.57309e-01 553 2001 11 2.63900e+01 7.42959e-01 586 2001 12 2.53823e+01 8.48895e-01 562 2002 1 2.37369e+01 9.61070e-01 753 2002 2 2.34464e+01 9.54291e-01 320 2002 3 2.42988e+01 1.06758e+00 512 2002 4 2.63593e+01 6.68423e-01 816 2002 5 2.66206e+01 1.32991e+00 937 2002 6 2.72643e+01 1.77692e+00 273 2002 7 2.87806e+01 1.19840e+00 2029 2002 8 2.96184e+01 8.03977e-01 1760 2002 9 2.86516e+01 7.49660e-01 1188 2002 10 2.82219e+01 7.83988e-01 3418 2002 11 2.70551e+01 1.25550e+00 2310 2002 12 2.42699e+01 9.77204e-01 2246 2003 1 2.35316e+01 1.17527e+00 2178 2003 2 2.22791e+01 8.88142e-01 2987 2003 3 2.56801e+01 8.32278e-01 2494 2003 4 2.53848e+01 7.70963e-01 2593 2003 5 2.70759e+01 1.01467e+00 3317 2003 6 2.90211e+01 1.09135e+00 1654 2003 7 2.87944e+01 1.32411e+00 1893 2003 8 2.95699e+01 1.08065e+00 1853 2003 9 2.96368e+01 9.43715e-01 1999 2003 10 2.84981e+01 1.09266e+00 2553 2003 11 2.64220e+01 8.35833e-01 2327 2003 12 2.43408e+01 1.22649e+00 1176 2004 1 2.46809e+01 8.40149e-01 2919 2004 2 2.35453e+01 7.98510e-01 2344 2004 3 2.43783e+01 8.23501e-01 2501 2004 4 2.40711e+01 8.99353e-01 3054 2004 5 2.57887e+01 8.21330e-01 2659 2004 6 2.84234e+01 1.25224e+00 2538 2004 7 2.89941e+01 1.21670e+00 2187 2004 8 3.00622e+01 9.57894e-01 2133 2004 9 2.89670e+01 1.00933e+00 2175 2004 10 2.79008e+01 7.43491e-01 3071 2004 11 2.66425e+01 5.49535e-01 2786 2004 12 2.49305e+01 1.30105e+00 2457 2005 1 2.34838e+01 8.49267e-01 2875 2005 2 2.35922e+01 1.15591e+00 2253 2005 3 2.34029e+01 8.86713e-01 2452 2005 4 2.46210e+01 1.07305e+00 2824 2005 5 2.61008e+01 1.33752e+00 2992 2005 6 2.75382e+01 8.83085e-01 1790 2005 7 2.91823e+01 1.14875e+00 2324 2005 8 3.00926e+01 1.02954e+00 2723 2005 9 2.89316e+01 1.33144e+00 2631 2005 10 2.76932e+01 1.04721e+00 1624 2005 11 2.55268e+01 8.01898e-01 2577 2005 12 2.43972e+01 1.01055e+00 2625 2006 1 2.34064e+01 9.46785e-01 2636 2006 2 2.33567e+01 1.10610e+00 2619 2006 3 2.48552e+01 6.64967e-01 2767 2006 4 2.55024e+01 8.61258e-01 3748 2006 5 2.66904e+01 8.80581e-01 2600 2006 6 2.83752e+01 1.11485e+00 2371 2006 7 2.88879e+01 9.95297e-01 1669 2006 8 2.94276e+01 7.12729e-01 2354 2006 9 3.02686e+01 9.14897e-01 1895 2006 10 2.84387e+01 9.10130e-01 2176 2006 11 2.60742e+01 8.88753e-01 1823 2006 12 2.48269e+01 9.86146e-01 1078 2007 1 2.47207e+01 5.50753e-01 1823 2007 2 2.41662e+01 7.89175e-01 1457 2007 3 2.46792e+01 6.98138e-01 2403 2007 4 2.47139e+01 1.24650e+00 2934 2007 5 2.67598e+01 7.02689e-01 3274 2007 6 2.79562e+01 1.27705e+00 2265 2007 7 3.00087e+01 1.14135e+00 2685 2007 8 2.98384e+01 8.29644e-01 2419 2007 9 2.95912e+01 1.02944e+00 1760 2007 10 2.80793e+01 9.55591e-01 1724 2007 11 2.67227e+01 8.97772e-01 2397 2007 12 2.55779e+01 6.71928e-01 3127 2008 1 2.38710e+01 8.85055e-01 2010 2008 2 2.40281e+01 1.07935e+00 2826 2008 3 2.40516e+01 1.13689e+00 2525 2008 4 2.50338e+01 7.72797e-01 3350 2008 5 2.68886e+01 1.07732e+00 3647 2008 6 2.79916e+01 8.90122e-01 2144 2008 7 2.89542e+01 1.12605e+00 2449 2008 8 2.97920e+01 8.85573e-01 2783 2008 9 2.81197e+01 9.08189e-01 1743 2008 10 2.78725e+01 8.14625e-01 1674 2008 11 2.57861e+01 5.89370e-01 2667 2008 12 2.39609e+01 6.27589e-01 2719 2009 1 2.30608e+01 1.22850e+00 2596 2009 2 2.32659e+01 7.01061e-01 2287 2009 3 2.40299e+01 9.78307e-01 2360 2009 4 2.48107e+01 7.87880e-01 2948 2009 5 2.64885e+01 1.30793e+00 3246 2009 6 2.88153e+01 1.13882e+00 1962 2009 7 2.93245e+01 1.02307e+00 2752 2009 8 2.96852e+01 1.07595e+00 3256 2009 9 3.01134e+01 1.13792e+00 1885 2009 10 2.92834e+01 1.03978e+00 3032 2009 11 2.70734e+01 8.80166e-01 1652 2009 12 2.52765e+01 9.98996e-01 2238 2010 1 2.37056e+01 1.40269e+00 1783 2010 2 2.29846e+01 8.32066e-01 1204 2010 3 2.33341e+01 9.21990e-01 2031 2010 4 2.44604e+01 1.34532e+00 2398 2010 5 2.70749e+01 1.13904e+00 3227 2010 6 2.95454e+01 1.18975e+00 2722 2010 7 2.89600e+01 1.13130e+00 1835 2010 8 3.01240e+01 1.09830e+00 2123 2010 9 2.96817e+01 8.81045e-01 1761 2010 10 2.80503e+01 8.42969e-01 2728 2010 11 2.61242e+01 7.97460e-01 2495 2010 12 2.35797e+01 1.29846e+00 2717 2011 1 2.23290e+01 8.85567e-01 2497 2011 2 2.16429e+01 9.58772e-01 3082 2011 3 2.43353e+01 1.34811e+00 2995 2011 4 2.56580e+01 7.85765e-01 3934 2011 5 2.70101e+01 9.88500e-01 3313 2011 6 2.85146e+01 1.18829e+00 2112 2011 7 2.96131e+01 1.07265e+00 2254 2011 8 3.02479e+01 1.26717e+00 2179 2011 9 2.98754e+01 9.77445e-01 2422 2011 10 2.82114e+01 1.15284e+00 1182 2011 11 2.56637e+01 6.49589e-01 2926 2011 12 2.45897e+01 1.12108e+00 2415 2012 1 2.40310e+01 1.00012e+00 2697 2012 2 2.40231e+01 6.54371e-01 1753 2012 3 2.47624e+01 6.40750e-01 2990 2012 4 2.58066e+01 9.14119e-01 1976 2012 5 2.65821e+01 1.37660e+00 2283 2012 6 2.84470e+01 7.05716e-01 1853 2012 7 2.85486e+01 9.96896e-01 2513 2012 8 2.95121e+01 1.19651e+00 2486 2012 9 2.91269e+01 1.56334e+00 1928 2012 10 2.80306e+01 7.99603e-01 2434 2012 11 2.68327e+01 7.47166e-01 2902 2012 12 2.54379e+01 7.55304e-01 2319 2013 1 2.43072e+01 6.55530e-01 2294 2013 2 2.43192e+01 7.96538e-01 2194 2013 3 2.31626e+01 7.16925e-01 2727 2013 4 2.54193e+01 1.35727e+00 2587 2013 5 2.63269e+01 8.44228e-01 2667 2013 6 2.79014e+01 1.16584e+00 2076 2013 7 2.90367e+01 1.29234e+00 2167 2013 8 2.94608e+01 1.23177e+00 1496 2013 9 2.94476e+01 9.36022e-01 1792 2013 10 2.84694e+01 8.45900e-01 2626 2013 11 2.72207e+01 6.63465e-01 1855 2013 12 2.55812e+01 9.14949e-01 2179 2014 1 2.40766e+01 9.55036e-01 1709 2014 2 2.46712e+01 7.15331e-01 3144 2014 3 2.44180e+01 5.79692e-01 2983 2014 4 2.56491e+01 7.35585e-01 2709 2014 5 2.66186e+01 7.59318e-01 2384 2014 6 2.86678e+01 1.12556e+00 1929 2014 7 2.98154e+01 1.06837e+00 2694 2014 8 3.06499e+01 8.35618e-01 2949 2014 9 2.96707e+01 1.42996e+00 1811 2014 10 2.86170e+01 1.09815e+00 2503 2014 11 2.64482e+01 8.70252e-01 2535 2014 12 2.52458e+01 6.33169e-01 2308 2015 1 2.49320e+01 9.02774e-01 2321 2015 2 2.32364e+01 7.65013e-01 2489 2015 3 2.46853e+01 1.07285e+00 3162 2015 4 2.57854e+01 1.17816e+00 2852 2015 5 2.71118e+01 9.63385e-01 3089 2015 6 2.87912e+01 1.19475e+00 2111 2015 7 2.96308e+01 1.23993e+00 2356 2015 8 3.02623e+01 1.03527e+00 2389 2015 9 3.04588e+01 9.46371e-01 1682 2015 10 2.85285e+01 6.88981e-01 2300 2015 11 2.74470e+01 6.37213e-01 2693 2015 12 2.58172e+01 9.12363e-01 1971 2016 1 2.58413e+01 1.09724e+00 599 2016 2 2.43189e+01 1.05576e+00 1811 2016 3 2.47490e+01 1.22608e+00 2165 2016 4 2.57588e+01 7.74065e-01 3177 2016 5 2.74083e+01 1.17437e+00 3314 2016 6 2.87289e+01 9.98370e-01 2292 2016 7 2.96357e+01 8.53681e-01 2763 2016 8 2.97591e+01 5.98375e-01 1808 2016 9 2.95715e+01 8.10915e-01 2328 2016 10 2.89575e+01 6.85230e-01 2196 2016 11 2.70041e+01 9.86210e-01 2813 2016 12 2.55498e+01 7.75955e-01 2879 2017 1 2.44143e+01 8.82565e-01 2802 2017 2 2.42815e+01 8.46366e-01 3090 2017 3 2.46875e+01 1.11029e+00 3377 2017 4 2.53334e+01 8.31692e-01 2584 2017 5 2.68592e+01 1.12797e+00 3135 2017 6 2.83886e+01 1.33965e+00 1986 2017 7 2.94259e+01 9.79556e-01 2282 2017 8 2.98589e+01 7.64467e-01 2251 2017 9 2.97647e+01 7.76575e-01 1912 2017 10 2.85042e+01 6.99541e-01 1439 2017 11 2.67173e+01 7.71622e-01 3520 2017 12 2.57732e+01 8.23113e-01 3921 2018 1 2.36348e+01 1.25664e+00 1366 2018 2 2.45369e+01 9.39283e-01 2686 2018 3 2.52888e+01 9.66670e-01 3214 2018 4 2.55538e+01 7.69476e-01 3005 2018 5 2.54702e+01 6.46542e-01 1376 2018 6 2.86779e+01 1.26073e+00 1908 2018 7 3.00504e+01 1.38688e+00 2151 2018 8 3.00094e+01 8.69920e-01 2390 2018 9 2.94249e+01 6.83298e-01 2676 2018 10 2.81866e+01 7.83991e-01 3025 2018 11 2.70582e+01 7.08021e-01 2163 2018 12 2.55089e+01 1.19121e+00 2658 2019 1 2.41008e+01 9.49182e-01 2518 2019 2 2.54126e+01 8.95338e-01 3222 2019 3 2.54906e+01 8.99651e-01 3182 2019 4 2.56937e+01 9.27966e-01 2899 2019 5 2.74811e+01 7.74118e-01 3478 2019 6 2.94117e+01 1.32624e+00 2896 2019 7 2.97404e+01 1.18901e+00 2626 2019 8 3.06632e+01 1.02882e+00 2111 2019 9 2.92524e+01 8.44782e-01 2475 2019 10 2.85447e+01 8.02204e-01 2712 2019 11 2.74935e+01 1.00435e+00 2665 2019 12 2.54273e+01 1.00788e+00 2461 2020 1 2.49514e+01 7.68451e-01 2268 2020 2 2.48408e+01 1.05586e+00 2372 2020 3 2.50927e+01 6.88333e-01 3745 2020 4 2.72274e+01 8.58023e-01 3207 2020 5 2.68561e+01 1.13976e+00 2366 2020 6 2.91457e+01 8.67679e-01 1717 2020 7 2.99498e+01 1.21296e+00 2110 2020 8 3.00762e+01 1.04172e+00 2608 2020 9 2.99551e+01 7.74102e-01 2396 2020 10 2.83655e+01 9.95877e-01 1714 2020 11 2.67982e+01 9.89579e-01 1901 2020 12 2.52649e+01 1.03108e+00 2702 2021 1 2.35989e+01 9.88687e-01 2058 2021 2 2.40151e+01 1.12013e+00 2896 2021 3 2.46344e+01 6.10082e-01 3461 2021 4 2.56790e+01 6.21259e-01 2936 2021 5 2.68562e+01 1.04237e+00 2971 2021 6 2.78964e+01 9.76728e-01 1403 2021 7 2.92680e+01 1.04492e+00 3041 2021 8 2.99067e+01 1.21010e+00 2411 2021 9 2.99669e+01 8.97332e-01 2874 2021 10 2.91377e+01 7.58193e-01 1953 2021 11 2.66691e+01 9.38104e-01 1922 2021 12 2.58257e+01 7.31704e-01 3560 2022 1 2.51288e+01 8.62832e-01 2194 2022 2 2.42057e+01 9.31845e-01 2819 2022 3 2.54128e+01 7.83387e-01 3179 2022 4 2.52991e+01 9.37726e-01 1882 2022 5 2.72022e+01 9.99283e-01 2938 2022 6 2.89792e+01 1.21990e+00 2093 2022 7 2.99724e+01 6.57228e-01 2582 2022 8 3.01119e+01 8.65172e-01 2910 2022 9 3.07301e+01 9.69773e-01 2304 2022 10 2.81742e+01 8.25714e-01 2508 2022 11 2.72348e+01 5.98706e-01 2430 2022 12 2.61708e+01 6.32141e-01 2862 2023 1 2.53536e+01 8.08141e-01 3033 2023 2 2.50494e+01 9.62400e-01 3037 2023 3 2.55868e+01 8.65480e-01 3303 2023 4 2.66231e+01 8.05774e-01 2477 2023 5 2.78567e+01 1.24808e+00 3159 2023 6 2.92452e+01 1.19229e+00 2776 2023 7 3.08168e+01 9.72087e-01 2135 2023 8 3.11944e+01 1.02940e+00 1979 2023 9 3.07035e+01 8.78860e-01 2443 2023 10 2.90336e+01 1.11005e+00 2704 2023 11 2.74603e+01 7.44359e-01 1888 2023 12 2.62409e+01 1.06910e+00 1243 2024 1 2.50647e+01 9.22310e-01 1742 2024 2 2.39552e+01 6.96209e-01 2357 2024 3 2.51239e+01 9.64568e-01 2396 2024 4 2.42756e+01 3.94909e-01 355