YEAR MONTH MEAN STDEV COUNT 2000 1 nan nan 0 2000 2 2.04601e+01 6.58626e-02 64 2000 3 2.27266e+01 5.42627e-01 726 2000 4 2.34260e+01 7.95362e-01 779 2000 5 2.60854e+01 1.32898e+00 741 2000 6 2.80123e+01 7.25476e-01 492 2000 7 2.97381e+01 1.11860e+00 527 2000 8 2.94789e+01 1.00759e+00 302 2000 9 2.89585e+01 1.04994e+00 414 2000 10 2.72470e+01 1.20299e+00 863 2000 11 2.52240e+01 6.38565e-01 758 2000 12 2.21533e+01 9.60383e-01 672 2001 1 1.91644e+01 1.19016e+00 618 2001 2 1.99571e+01 1.05897e+00 384 2001 3 2.06669e+01 4.65913e-01 526 2001 4 2.34110e+01 1.73826e+00 903 2001 5 2.47366e+01 1.21228e+00 522 2001 6 2.78291e+01 9.43935e-01 353 2001 7 2.84879e+01 6.72616e-01 380 2001 8 2.87765e+01 1.37277e+00 399 2001 9 2.82214e+01 1.10182e+00 563 2001 10 2.72668e+01 1.00562e+00 281 2001 11 2.42726e+01 4.97797e-01 832 2001 12 2.38430e+01 9.21654e-01 901 2002 1 2.22281e+01 9.40151e-01 704 2002 2 2.13707e+01 9.75333e-01 530 2002 3 2.15116e+01 1.02881e+00 605 2002 4 2.54095e+01 1.01173e+00 726 2002 5 2.68117e+01 8.31909e-01 782 2002 6 2.73613e+01 1.43123e+00 359 2002 7 2.93480e+01 9.23102e-01 1536 2002 8 2.98020e+01 8.74259e-01 1420 2002 9 2.91178e+01 8.98179e-01 1216 2002 10 2.86729e+01 6.72668e-01 3302 2002 11 2.68131e+01 1.87495e+00 2239 2002 12 2.27879e+01 1.08859e+00 2401 2003 1 1.96580e+01 1.28792e+00 1975 2003 2 1.87404e+01 9.45216e-01 2302 2003 3 2.31638e+01 1.22836e+00 1931 2003 4 2.19766e+01 1.33570e+00 2444 2003 5 2.70788e+01 1.25960e+00 3453 2003 6 2.87145e+01 8.86406e-01 1425 2003 7 2.89041e+01 1.36715e+00 1867 2003 8 2.95997e+01 1.32844e+00 1323 2003 9 2.92717e+01 6.73220e-01 1900 2003 10 2.76332e+01 1.21356e+00 2887 2003 11 2.45795e+01 8.88716e-01 3077 2003 12 2.12344e+01 1.21548e+00 1975 2004 1 2.00668e+01 5.96951e-01 2927 2004 2 1.97625e+01 5.77518e-01 2196 2004 3 2.09058e+01 1.02792e+00 3026 2004 4 2.23874e+01 1.00205e+00 2877 2004 5 2.57959e+01 1.35609e+00 3457 2004 6 2.88830e+01 9.23047e-01 2737 2004 7 2.95180e+01 1.22578e+00 2384 2004 8 2.99162e+01 1.33044e+00 2287 2004 9 2.88447e+01 1.30591e+00 1840 2004 10 2.77157e+01 1.12114e+00 2618 2004 11 2.57739e+01 9.25697e-01 2739 2004 12 2.29046e+01 1.42817e+00 2201 2005 1 2.04131e+01 5.62996e-01 2894 2005 2 1.98957e+01 8.49788e-01 2718 2005 3 2.10046e+01 1.64972e+00 1939 2005 4 2.22453e+01 8.29962e-01 2863 2005 5 2.49734e+01 1.76263e+00 3110 2005 6 2.77770e+01 1.09111e+00 1427 2005 7 2.89490e+01 1.29282e+00 2537 2005 8 3.06478e+01 1.28044e+00 1847 2005 9 2.92531e+01 9.21345e-01 2279 2005 10 2.74476e+01 9.40268e-01 1852 2005 11 2.48061e+01 8.27424e-01 2981 2005 12 2.30265e+01 1.15153e+00 2263 2006 1 2.12767e+01 6.54785e-01 2595 2006 2 2.01514e+01 8.82328e-01 2643 2006 3 2.12268e+01 1.04785e+00 3492 2006 4 2.42560e+01 1.68918e+00 3548 2006 5 2.64120e+01 1.24134e+00 2789 2006 6 2.83399e+01 9.52603e-01 2336 2006 7 2.86034e+01 9.23190e-01 1746 2006 8 2.96490e+01 1.10724e+00 2327 2006 9 2.98502e+01 1.00828e+00 2599 2006 10 2.86939e+01 1.14821e+00 2796 2006 11 2.48399e+01 1.34836e+00 1781 2006 12 2.24598e+01 6.12886e-01 1959 2007 1 2.26197e+01 5.92812e-01 2581 2007 2 2.11146e+01 6.94088e-01 1929 2007 3 2.16172e+01 6.29446e-01 3429 2007 4 2.32626e+01 1.00647e+00 3211 2007 5 2.55405e+01 9.85735e-01 3484 2007 6 2.80052e+01 1.25051e+00 2498 2007 7 3.03136e+01 1.26233e+00 2044 2007 8 3.00316e+01 7.22810e-01 3052 2007 9 2.97889e+01 1.03945e+00 1647 2007 10 2.83148e+01 9.42238e-01 2163 2007 11 2.54599e+01 1.06982e+00 3256 2007 12 2.39811e+01 6.31397e-01 3161 2008 1 2.15533e+01 6.58794e-01 2495 2008 2 2.18426e+01 9.51992e-01 2321 2008 3 2.17353e+01 9.26712e-01 2724 2008 4 2.42652e+01 6.24773e-01 3426 2008 5 2.62086e+01 1.12068e+00 3680 2008 6 2.82723e+01 8.86257e-01 2433 2008 7 2.95562e+01 1.27431e+00 1398 2008 8 2.96813e+01 9.69823e-01 2008 2008 9 2.91118e+01 1.00378e+00 2005 2008 10 2.78868e+01 1.21940e+00 2158 2008 11 2.40306e+01 1.10336e+00 3330 2008 12 2.15607e+01 6.09277e-01 3513 2009 1 2.05697e+01 9.00580e-01 2909 2009 2 1.89187e+01 7.12666e-01 2877 2009 3 1.98692e+01 1.19803e+00 2831 2009 4 2.42014e+01 6.72335e-01 3097 2009 5 2.60377e+01 1.16840e+00 3129 2009 6 2.85050e+01 1.10355e+00 2382 2009 7 2.96200e+01 1.15669e+00 2256 2009 8 3.00506e+01 8.30668e-01 2664 2009 9 3.01410e+01 1.05344e+00 1999 2009 10 2.94614e+01 1.34921e+00 2943 2009 11 2.58507e+01 1.48270e+00 1645 2009 12 2.36438e+01 9.73807e-01 1948 2010 1 1.99931e+01 1.47314e+00 2021 2010 2 1.93467e+01 1.63250e+00 1152 2010 3 1.83389e+01 8.42801e-01 2685 2010 4 2.18138e+01 1.54421e+00 2181 2010 5 2.67082e+01 1.28834e+00 3638 2010 6 2.95834e+01 1.09236e+00 2784 2010 7 2.90952e+01 1.26537e+00 2067 2010 8 3.02744e+01 1.17601e+00 1572 2010 9 2.95796e+01 9.82086e-01 2181 2010 10 2.77803e+01 1.08408e+00 3004 2010 11 2.50101e+01 1.27811e+00 3121 2010 12 2.12145e+01 1.75699e+00 2759 2011 1 1.85204e+01 8.67307e-01 2780 2011 2 1.88495e+01 1.15468e+00 2984 2011 3 2.13915e+01 1.37844e+00 3987 2011 4 2.51172e+01 1.01774e+00 3641 2011 5 2.70778e+01 9.59621e-01 3366 2011 6 2.84655e+01 1.25244e+00 2333 2011 7 2.96408e+01 1.36079e+00 1885 2011 8 3.01826e+01 1.06907e+00 2344 2011 9 2.99918e+01 7.72634e-01 2241 2011 10 2.85895e+01 1.33421e+00 1266 2011 11 2.46824e+01 6.50975e-01 3276 2011 12 2.27158e+01 7.80144e-01 3333 2012 1 2.15460e+01 6.77074e-01 2605 2012 2 2.20003e+01 1.08915e+00 1647 2012 3 2.35095e+01 6.91782e-01 4164 2012 4 2.47359e+01 1.20227e+00 2559 2012 5 2.68821e+01 1.53754e+00 2783 2012 6 2.83759e+01 1.09554e+00 1795 2012 7 2.88154e+01 1.27465e+00 2370 2012 8 2.97640e+01 1.31310e+00 2498 2012 9 2.86616e+01 9.33279e-01 2118 2012 10 2.72806e+01 1.13227e+00 2363 2012 11 2.40894e+01 1.09327e+00 2918 2012 12 2.24687e+01 7.10880e-01 2746 2013 1 2.18838e+01 6.55357e-01 2799 2013 2 2.16515e+01 6.76993e-01 2431 2013 3 2.08522e+01 6.79368e-01 2709 2013 4 2.31646e+01 1.80566e+00 3261 2013 5 2.59090e+01 1.05390e+00 2821 2013 6 2.83057e+01 1.08751e+00 2109 2013 7 2.84772e+01 1.23959e+00 2240 2013 8 2.96190e+01 1.23441e+00 1718 2013 9 2.90883e+01 7.97541e-01 1253 2013 10 2.85665e+01 1.08954e+00 2448 2013 11 2.57130e+01 1.18909e+00 2032 2013 12 2.40245e+01 5.71204e-01 2351 2014 1 2.19926e+01 1.04570e+00 1768 2014 2 2.20758e+01 8.08979e-01 2574 2014 3 2.30286e+01 6.54886e-01 2702 2014 4 2.40437e+01 1.27408e+00 2541 2014 5 2.58994e+01 6.67991e-01 2727 2014 6 2.86663e+01 1.31029e+00 2125 2014 7 3.01873e+01 9.93651e-01 2156 2014 8 3.10221e+01 9.12274e-01 2178 2014 9 2.96729e+01 1.31912e+00 1341 2014 10 2.84980e+01 1.20819e+00 2336 2014 11 2.52884e+01 1.74881e+00 2455 2014 12 2.24418e+01 8.89000e-01 2269 2015 1 2.16531e+01 7.46268e-01 1934 2015 2 2.04571e+01 5.27593e-01 2491 2015 3 2.31189e+01 1.62597e+00 3448 2015 4 2.54794e+01 1.73531e+00 3038 2015 5 2.71372e+01 1.05371e+00 3117 2015 6 2.88549e+01 1.09152e+00 2242 2015 7 2.99419e+01 7.50883e-01 2105 2015 8 3.07833e+01 1.09533e+00 2297 2015 9 3.01194e+01 1.38514e+00 1358 2015 10 2.87997e+01 1.16795e+00 2238 2015 11 2.68387e+01 1.02982e+00 2893 2015 12 2.48341e+01 5.85317e-01 2218 2016 1 2.30524e+01 1.29910e+00 877 2016 2 2.03657e+01 9.30498e-01 2274 2016 3 2.16097e+01 1.50936e+00 1365 2016 4 2.38225e+01 9.64830e-01 3058 2016 5 2.68086e+01 1.50216e+00 2943 2016 6 2.87931e+01 1.34710e+00 2568 2016 7 3.01840e+01 1.21303e+00 1998 2016 8 3.03320e+01 5.65865e-01 2055 2016 9 2.98592e+01 1.25437e+00 2200 2016 10 2.79998e+01 1.46208e+00 2295 2016 11 2.45767e+01 9.31059e-01 3459 2016 12 2.33836e+01 7.35613e-01 2977 2017 1 2.18999e+01 7.57251e-01 3196 2017 2 2.13559e+01 7.78070e-01 3070 2017 3 2.23485e+01 7.94761e-01 3807 2017 4 2.39221e+01 1.03596e+00 2548 2017 5 2.64364e+01 1.14248e+00 3051 2017 6 2.88756e+01 1.46553e+00 1576 2017 7 3.00073e+01 1.22577e+00 2006 2017 8 3.05644e+01 1.10664e+00 2218 2017 9 2.97052e+01 9.17718e-01 2319 2017 10 2.82492e+01 8.60793e-01 1948 2017 11 2.52521e+01 6.62718e-01 3335 2017 12 2.38322e+01 8.49350e-01 3308 2018 1 2.10713e+01 1.40297e+00 1747 2018 2 2.18880e+01 1.34232e+00 3330 2018 3 2.27513e+01 8.01398e-01 3490 2018 4 2.42781e+01 8.94981e-01 3491 2018 5 2.47861e+01 9.70436e-01 1237 2018 6 2.81493e+01 1.26953e+00 1681 2018 7 3.02522e+01 1.05259e+00 2501 2018 8 2.98127e+01 7.48439e-01 2098 2018 9 2.99456e+01 1.13318e+00 1978 2018 10 2.82090e+01 7.98356e-01 3154 2018 11 2.61783e+01 9.59558e-01 2307 2018 12 2.34223e+01 1.18753e+00 1952 2019 1 2.20907e+01 1.03456e+00 2088 2019 2 2.27198e+01 1.66209e+00 2881 2019 3 2.46122e+01 9.82582e-01 3081 2019 4 2.50444e+01 6.38524e-01 2906 2019 5 2.73157e+01 7.79220e-01 3157 2019 6 3.02021e+01 1.25212e+00 2595 2019 7 3.00831e+01 8.79115e-01 1672 2019 8 3.05202e+01 1.18568e+00 1583 2019 9 2.97243e+01 1.07048e+00 2527 2019 10 2.82278e+01 9.66648e-01 2537 2019 11 2.67598e+01 1.31228e+00 2509 2019 12 2.42835e+01 8.52971e-01 2141 2020 1 2.25647e+01 1.01237e+00 3062 2020 2 2.18102e+01 8.54504e-01 2679 2020 3 2.31379e+01 1.72147e+00 3880 2020 4 2.62291e+01 1.09240e+00 2742 2020 5 2.64454e+01 1.16485e+00 2012 2020 6 2.95949e+01 1.11237e+00 1638 2020 7 3.01052e+01 9.98772e-01 1978 2020 8 3.00224e+01 1.21129e+00 2276 2020 9 2.97709e+01 6.79481e-01 1839 2020 10 2.87594e+01 9.63093e-01 1377 2020 11 2.62659e+01 9.12347e-01 2552 2020 12 2.33610e+01 1.03889e+00 2547 2021 1 2.13761e+01 8.29254e-01 2215 2021 2 2.11897e+01 8.37944e-01 2842 2021 3 2.23998e+01 9.28786e-01 3032 2021 4 2.39657e+01 1.15381e+00 3009 2021 5 2.65296e+01 8.89272e-01 2711 2021 6 2.75658e+01 8.48907e-01 1357 2021 7 2.92881e+01 1.03034e+00 2478 2021 8 2.99667e+01 1.04395e+00 1426 2021 9 3.02017e+01 7.58985e-01 2663 2021 10 2.87609e+01 1.13970e+00 2209 2021 11 2.55111e+01 1.23172e+00 2213 2021 12 2.40649e+01 4.16757e-01 3636 2022 1 2.33665e+01 7.80564e-01 1872 2022 2 2.13419e+01 6.83093e-01 2593 2022 3 2.35649e+01 1.10850e+00 3279 2022 4 2.50007e+01 1.16844e+00 1483 2022 5 2.70274e+01 8.87136e-01 3372 2022 6 2.88686e+01 1.37119e+00 2547 2022 7 2.99527e+01 7.09842e-01 2320 2022 8 3.02427e+01 9.52663e-01 1847 2022 9 3.04703e+01 8.18229e-01 1884 2022 10 2.77562e+01 7.79503e-01 2242 2022 11 2.65637e+01 7.43137e-01 2617 2022 12 2.49594e+01 9.83428e-01 2739 2023 1 2.16070e+01 1.13933e+00 2983 2023 2 2.30346e+01 1.27150e+00 3718 2023 3 2.47887e+01 8.24832e-01 3611 2023 4 2.60994e+01 8.86097e-01 2733 2023 5 2.78555e+01 1.11362e+00 3289 2023 6 2.89977e+01 1.04887e+00 2782 2023 7 3.12827e+01 9.85459e-01 2557 2023 8 3.11545e+01 9.59024e-01 1996 2023 9 3.08888e+01 1.09639e+00 2210 2023 10 2.89284e+01 1.21044e+00 2901 2023 11 2.60753e+01 5.33774e-01 2056 2023 12 2.37194e+01 1.85025e+00 1022 2024 1 2.20941e+01 7.28772e-01 1152 2024 2 2.10235e+01 4.86695e-01 2419 2024 3 2.29279e+01 1.22007e+00 2255 2024 4 2.33668e+01 3.33755e-01 356