YEAR MONTH MEAN STDEV COUNT 2000 1 nan nan 0 2000 2 2.63628e+01 2.36717e-01 192 2000 3 2.54818e+01 1.11920e+00 634 2000 4 2.62044e+01 5.29531e-01 582 2000 5 2.78871e+01 8.17629e-01 529 2000 6 2.69806e+01 4.58711e-01 512 2000 7 2.80217e+01 1.03655e+00 654 2000 8 2.81089e+01 9.20657e-01 346 2000 9 2.90250e+01 7.59865e-01 688 2000 10 2.91557e+01 4.56361e-01 396 2000 11 2.84891e+01 7.55620e-01 1014 2000 12 2.69163e+01 7.17384e-01 537 2001 1 2.59782e+01 4.75276e-01 636 2001 2 2.60645e+01 3.92785e-01 512 2001 3 2.62080e+01 8.65570e-01 360 2001 4 2.68464e+01 7.28587e-01 812 2001 5 2.74655e+01 5.55600e-01 532 2001 6 2.78986e+01 5.23757e-01 320 2001 7 2.79100e+01 8.62324e-01 390 2001 8 2.83149e+01 8.25690e-01 579 2001 9 2.90995e+01 8.46784e-01 804 2001 10 2.88986e+01 6.04079e-01 555 2001 11 2.85452e+01 7.96683e-01 563 2001 12 2.75961e+01 7.11074e-01 732 2002 1 2.68165e+01 5.83241e-01 683 2002 2 2.61271e+01 6.99564e-01 695 2002 3 2.68085e+01 4.36813e-01 768 2002 4 2.73613e+01 4.94073e-01 266 2002 5 2.72839e+01 6.30502e-01 756 2002 6 2.75675e+01 5.22558e-01 326 2002 7 2.78788e+01 8.87242e-01 1891 2002 8 2.85847e+01 8.00055e-01 1580 2002 9 2.88314e+01 6.67287e-01 2065 2002 10 2.87564e+01 7.06830e-01 3176 2002 11 2.85935e+01 4.98182e-01 3717 2002 12 2.73271e+01 4.17665e-01 3464 2003 1 2.68029e+01 4.91607e-01 3506 2003 2 2.64729e+01 4.59818e-01 2986 2003 3 2.67643e+01 6.03606e-01 3669 2003 4 2.75776e+01 6.65909e-01 2140 2003 5 2.75123e+01 8.55615e-01 2258 2003 6 2.74928e+01 7.41459e-01 1361 2003 7 2.71802e+01 9.40879e-01 1584 2003 8 2.84201e+01 6.11017e-01 2322 2003 9 2.93033e+01 7.34901e-01 2330 2003 10 2.93474e+01 6.86417e-01 2498 2003 11 2.83637e+01 7.79254e-01 1565 2003 12 2.74709e+01 5.51498e-01 2583 2004 1 2.69221e+01 5.66346e-01 2996 2004 2 2.65699e+01 4.41856e-01 2841 2004 3 2.66356e+01 4.46317e-01 3447 2004 4 2.78629e+01 5.62975e-01 2832 2004 5 2.71666e+01 7.55879e-01 1462 2004 6 2.79590e+01 1.03768e+00 1513 2004 7 2.78325e+01 7.42619e-01 2026 2004 8 2.86525e+01 6.63206e-01 2224 2004 9 2.88212e+01 1.00976e+00 1406 2004 10 2.92255e+01 8.26536e-01 2277 2004 11 2.80502e+01 8.09119e-01 2092 2004 12 2.71215e+01 5.44066e-01 3460 2005 1 2.64401e+01 5.20587e-01 2534 2005 2 2.59722e+01 4.00185e-01 2734 2005 3 2.68940e+01 6.66448e-01 3587 2005 4 2.79367e+01 9.48079e-01 2753 2005 5 2.85556e+01 7.92063e-01 1804 2005 6 2.87938e+01 6.36759e-01 1328 2005 7 2.86742e+01 8.29958e-01 1610 2005 8 2.93242e+01 9.14766e-01 1763 2005 9 2.97931e+01 8.54283e-01 2147 2005 10 2.92004e+01 8.44146e-01 1496 2005 11 2.85784e+01 5.83278e-01 2776 2005 12 2.75451e+01 6.24463e-01 2996 2006 1 2.65639e+01 3.88800e-01 2797 2006 2 2.64108e+01 4.08240e-01 3089 2006 3 2.67146e+01 4.74573e-01 2789 2006 4 2.77390e+01 6.56252e-01 2990 2006 5 2.83564e+01 6.10153e-01 2108 2006 6 2.85128e+01 7.13086e-01 1957 2006 7 2.81932e+01 6.69398e-01 1731 2006 8 2.83524e+01 7.17187e-01 2139 2006 9 2.93509e+01 6.00728e-01 2318 2006 10 2.96054e+01 5.83024e-01 2497 2006 11 2.87673e+01 6.10010e-01 3476 2006 12 2.76556e+01 8.38739e-01 3876 2007 1 2.67853e+01 3.55736e-01 3559 2007 2 2.66925e+01 4.13457e-01 3218 2007 3 2.68407e+01 6.79285e-01 2081 2007 4 2.76588e+01 7.54536e-01 3088 2007 5 2.86340e+01 8.66640e-01 1873 2007 6 2.83452e+01 8.77258e-01 1806 2007 7 2.80739e+01 8.51234e-01 1657 2007 8 2.83840e+01 6.25625e-01 1759 2007 9 2.90494e+01 7.78189e-01 2498 2007 10 2.91738e+01 4.96879e-01 1318 2007 11 2.82287e+01 5.21057e-01 2339 2007 12 2.72690e+01 4.78434e-01 3403 2008 1 2.66213e+01 6.31680e-01 3414 2008 2 2.60415e+01 3.27815e-01 3477 2008 3 2.62367e+01 4.23095e-01 3187 2008 4 2.65253e+01 5.99310e-01 2880 2008 5 2.76916e+01 6.82620e-01 2277 2008 6 2.79304e+01 7.54790e-01 1780 2008 7 2.79206e+01 7.95073e-01 2464 2008 8 2.90661e+01 5.92009e-01 2524 2008 9 2.89810e+01 9.20912e-01 1744 2008 10 2.90491e+01 5.02595e-01 2778 2008 11 2.85100e+01 6.44262e-01 2021 2008 12 2.69106e+01 4.73106e-01 3709 2009 1 2.62327e+01 4.02442e-01 3749 2009 2 2.61859e+01 5.65928e-01 2446 2009 3 2.60757e+01 5.59071e-01 2722 2009 4 2.65855e+01 6.71182e-01 2660 2009 5 2.71718e+01 7.98797e-01 1548 2009 6 2.80201e+01 7.78220e-01 1907 2009 7 2.81313e+01 7.18347e-01 1797 2009 8 2.84070e+01 6.82947e-01 2424 2009 9 2.92559e+01 7.70221e-01 2365 2009 10 2.92299e+01 6.15005e-01 2640 2009 11 2.87861e+01 5.52285e-01 3281 2009 12 2.77944e+01 5.54313e-01 3096 2010 1 2.70660e+01 5.25079e-01 2433 2010 2 2.71608e+01 5.12115e-01 2730 2010 3 2.78541e+01 6.51652e-01 2843 2010 4 2.77562e+01 5.52550e-01 2504 2010 5 2.88096e+01 7.27798e-01 1816 2010 6 2.91652e+01 5.96487e-01 1646 2010 7 2.85800e+01 6.55138e-01 1405 2010 8 2.94528e+01 6.76529e-01 2173 2010 9 2.95589e+01 5.32386e-01 1627 2010 10 2.92902e+01 8.68071e-01 2133 2010 11 2.79241e+01 6.86096e-01 1196 2010 12 2.71709e+01 7.41726e-01 2017 2011 1 2.62652e+01 5.49808e-01 3028 2011 2 2.63422e+01 4.80331e-01 3096 2011 3 2.66181e+01 4.85032e-01 3198 2011 4 2.73969e+01 5.80875e-01 3030 2011 5 2.79330e+01 9.28789e-01 1380 2011 6 2.88393e+01 7.22280e-01 1485 2011 7 2.83609e+01 8.28436e-01 1619 2011 8 2.85618e+01 6.22157e-01 1902 2011 9 2.93518e+01 6.41301e-01 1609 2011 10 2.91672e+01 6.78127e-01 2904 2011 11 2.84931e+01 5.53752e-01 2383 2011 12 2.78821e+01 8.55646e-01 3038 2012 1 2.66538e+01 5.93523e-01 3536 2012 2 2.65070e+01 4.36102e-01 2946 2012 3 2.64894e+01 5.70468e-01 3362 2012 4 2.72663e+01 9.13052e-01 2203 2012 5 2.76266e+01 6.93218e-01 2310 2012 6 2.79928e+01 7.28082e-01 1955 2012 7 2.81051e+01 7.49476e-01 2027 2012 8 2.83726e+01 5.66222e-01 1908 2012 9 2.93780e+01 6.94414e-01 2549 2012 10 2.93211e+01 7.93249e-01 1658 2012 11 2.91146e+01 5.58540e-01 3161 2012 12 2.77700e+01 8.94798e-01 2919 2013 1 2.66678e+01 3.74622e-01 3124 2013 2 2.61653e+01 4.42535e-01 3107 2013 3 2.66602e+01 7.08089e-01 2483 2013 4 2.73524e+01 6.39796e-01 3407 2013 5 2.84799e+01 7.16603e-01 1988 2013 6 2.73881e+01 8.70656e-01 1279 2013 7 2.83408e+01 6.73052e-01 2656 2013 8 2.87945e+01 5.71562e-01 2396 2013 9 2.93472e+01 6.94576e-01 2081 2013 10 2.93440e+01 7.38914e-01 2317 2013 11 2.84729e+01 7.16363e-01 2645 2013 12 2.72241e+01 5.33910e-01 3065 2014 1 2.65521e+01 4.14221e-01 3615 2014 2 2.64460e+01 3.50413e-01 3700 2014 3 2.68364e+01 5.67471e-01 3572 2014 4 2.71388e+01 6.00784e-01 2616 2014 5 2.77887e+01 6.59664e-01 2630 2014 6 2.74340e+01 9.19896e-01 1707 2014 7 2.79040e+01 8.01585e-01 2083 2014 8 2.82605e+01 8.06054e-01 1914 2014 9 2.88373e+01 8.15702e-01 1716 2014 10 2.92164e+01 7.37250e-01 2893 2014 11 2.86785e+01 6.51271e-01 2754 2014 12 2.77732e+01 7.15839e-01 3399 2015 1 2.68450e+01 4.94872e-01 3529 2015 2 2.69506e+01 4.64139e-01 2543 2015 3 2.68110e+01 4.51894e-01 3381 2015 4 2.68925e+01 5.80075e-01 3263 2015 5 2.74036e+01 7.68911e-01 2199 2015 6 2.75945e+01 9.15568e-01 1813 2015 7 2.74858e+01 8.24349e-01 2530 2015 8 2.83119e+01 6.94492e-01 2418 2015 9 2.92033e+01 7.36300e-01 2490 2015 10 2.96646e+01 6.18065e-01 2164 2015 11 2.85433e+01 7.23776e-01 1875 2015 12 2.75304e+01 5.92028e-01 2551 2016 1 2.67957e+01 7.32801e-01 2667 2016 2 2.68943e+01 3.98452e-01 2656 2016 3 2.69885e+01 4.65289e-01 2989 2016 4 2.75832e+01 9.07085e-01 2147 2016 5 2.78876e+01 6.40392e-01 1412 2016 6 2.80988e+01 9.90074e-01 1594 2016 7 2.85550e+01 5.82280e-01 2615 2016 8 2.88630e+01 5.48603e-01 2316 2016 9 2.95729e+01 6.55828e-01 3146 2016 10 2.93947e+01 9.52938e-01 2024 2016 11 2.86873e+01 6.76694e-01 1480 2016 12 2.77258e+01 5.77726e-01 3644 2017 1 2.67913e+01 4.48423e-01 2822 2017 2 2.68265e+01 5.18796e-01 3142 2017 3 2.68707e+01 6.48613e-01 2273 2017 4 2.76583e+01 5.75302e-01 2457 2017 5 2.78998e+01 7.11450e-01 2540 2017 6 2.83450e+01 6.77923e-01 2263 2017 7 2.86359e+01 5.89422e-01 2819 2017 8 2.89258e+01 7.94481e-01 2788 2017 9 2.88431e+01 1.37948e+00 884 2017 10 2.85262e+01 6.96937e-01 2104 2017 11 2.84707e+01 7.37724e-01 1938 2017 12 2.78308e+01 5.85401e-01 3527 2018 1 2.69276e+01 6.25012e-01 2652 2018 2 2.62593e+01 4.22887e-01 2873 2018 3 2.68488e+01 7.34398e-01 3167 2018 4 2.74269e+01 6.21822e-01 2800 2018 5 2.73887e+01 6.29433e-01 2611 2018 6 2.78001e+01 9.07339e-01 1733 2018 7 2.77310e+01 7.13208e-01 1035 2018 8 2.85017e+01 5.34235e-01 2833 2018 9 2.89080e+01 9.29381e-01 2284 2018 10 2.86909e+01 5.68734e-01 1890 2018 11 2.83599e+01 8.23645e-01 3287 2018 12 2.72923e+01 5.86715e-01 3545 2019 1 2.64121e+01 4.81628e-01 2726 2019 2 2.64776e+01 5.20590e-01 3052 2019 3 2.65388e+01 5.88840e-01 2941 2019 4 2.71826e+01 4.75410e-01 2887 2019 5 2.76041e+01 8.99994e-01 1233 2019 6 2.81026e+01 5.56094e-01 2546 2019 7 2.83388e+01 8.05061e-01 2535 2019 8 2.88064e+01 6.23079e-01 2489 2019 9 2.94144e+01 5.97852e-01 1964 2019 10 2.94827e+01 6.83049e-01 2940 2019 11 2.89962e+01 4.96557e-01 3576 2019 12 2.82540e+01 8.98846e-01 3227 2020 1 2.72096e+01 6.02321e-01 3020 2020 2 2.69791e+01 4.32466e-01 3482 2020 3 2.73463e+01 6.39438e-01 2575 2020 4 2.79826e+01 6.67936e-01 3336 2020 5 2.81829e+01 8.66432e-01 2315 2020 6 2.87691e+01 7.57080e-01 2586 2020 7 2.85940e+01 8.13510e-01 1980 2020 8 2.91344e+01 6.76632e-01 2113 2020 9 2.99515e+01 8.32848e-01 2481 2020 10 2.92422e+01 6.27113e-01 2160 2020 11 2.81192e+01 7.62402e-01 1728 2020 12 2.77169e+01 4.56810e-01 3670 2021 1 2.68233e+01 6.08835e-01 2929 2021 2 2.65399e+01 4.61311e-01 3319 2021 3 2.68238e+01 4.74826e-01 3705 2021 4 2.72778e+01 7.45277e-01 2303 2021 5 2.76917e+01 6.52848e-01 2446 2021 6 2.77310e+01 8.25105e-01 1874 2021 7 2.80374e+01 8.36516e-01 2030 2021 8 2.84678e+01 5.81454e-01 1969 2021 9 2.96362e+01 7.19413e-01 3111 2021 10 2.93505e+01 7.39569e-01 2822 2021 11 2.87814e+01 5.04559e-01 2839 2021 12 2.77297e+01 5.50906e-01 3618 2022 1 2.68319e+01 4.41751e-01 3792 2022 2 2.68615e+01 4.62394e-01 3031 2022 3 2.68425e+01 6.21888e-01 3127 2022 4 2.72832e+01 7.64622e-01 985 2022 5 2.76279e+01 7.50602e-01 2775 2022 6 2.83308e+01 7.11951e-01 2155 2022 7 2.80773e+01 5.62286e-01 2242 2022 8 2.88978e+01 6.78402e-01 2626 2022 9 2.92705e+01 8.39186e-01 1800 2022 10 2.92187e+01 6.47157e-01 1775 2022 11 2.80222e+01 5.65471e-01 2964 2022 12 2.72146e+01 5.43763e-01 3485 2023 1 2.66727e+01 5.10767e-01 3367 2023 2 2.62088e+01 4.33953e-01 2881 2023 3 2.66233e+01 7.90381e-01 3275 2023 4 2.71617e+01 5.62378e-01 3133 2023 5 2.85520e+01 9.60314e-01 2546 2023 6 2.87976e+01 8.15760e-01 1877 2023 7 2.88982e+01 6.36117e-01 1437 2023 8 2.94719e+01 7.06285e-01 2510 2023 9 3.01129e+01 8.94901e-01 2759 2023 10 3.04107e+01 7.37288e-01 2128 2023 11 2.88894e+01 7.66700e-01 2634 2023 12 2.80415e+01 5.52090e-01 3447 2024 1 2.74029e+01 5.21061e-01 3402 2024 2 2.70681e+01 6.06049e-01 2670 2024 3 2.76168e+01 4.80826e-01 3262 2024 4 2.76694e+01 4.81226e-01 384