YEAR MONTH MEAN STDEV COUNT 2000 1 nan nan 0 2000 2 2.39676e+01 6.45717e-01 184 2000 3 2.41627e+01 4.57329e-01 561 2000 4 2.51543e+01 9.87115e-01 747 2000 5 2.67210e+01 1.24139e+00 749 2000 6 2.79774e+01 6.73570e-01 492 2000 7 2.94916e+01 1.68574e+00 655 2000 8 2.94737e+01 1.31739e+00 241 2000 9 2.92117e+01 9.06050e-01 498 2000 10 2.76723e+01 1.01744e+00 1005 2000 11 2.55111e+01 6.93365e-01 612 2000 12 2.44885e+01 7.65539e-01 542 2001 1 2.25818e+01 1.13954e+00 710 2001 2 2.34926e+01 1.03042e+00 670 2001 3 2.27662e+01 7.34183e-01 640 2001 4 2.48196e+01 1.06169e+00 916 2001 5 2.53962e+01 8.94982e-01 434 2001 6 2.71590e+01 1.68217e+00 320 2001 7 2.84056e+01 1.40087e+00 787 2001 8 3.05068e+01 2.54180e-01 320 2001 9 2.83890e+01 1.23625e+00 497 2001 10 2.76631e+01 9.45208e-01 383 2001 11 2.60095e+01 6.59205e-01 555 2001 12 2.47852e+01 7.23715e-01 726 2002 1 2.31626e+01 9.76204e-01 727 2002 2 2.29285e+01 1.23733e+00 416 2002 3 2.35606e+01 9.10675e-01 512 2002 4 2.66517e+01 5.74542e-01 833 2002 5 2.64713e+01 1.22263e+00 953 2002 6 2.78535e+01 1.11942e+00 244 2002 7 2.87264e+01 9.90940e-01 2117 2002 8 2.94639e+01 8.01730e-01 1730 2002 9 2.87873e+01 9.85582e-01 1209 2002 10 2.82736e+01 6.53247e-01 3306 2002 11 2.67966e+01 1.33326e+00 2356 2002 12 2.39263e+01 8.36032e-01 2062 2003 1 2.20959e+01 1.05844e+00 2115 2003 2 2.17034e+01 8.50434e-01 2512 2003 3 2.38773e+01 1.06390e+00 1629 2003 4 2.46063e+01 8.24160e-01 3102 2003 5 2.73148e+01 1.02196e+00 3169 2003 6 2.90355e+01 1.11250e+00 1755 2003 7 2.87629e+01 1.16718e+00 2239 2003 8 2.95733e+01 1.31127e+00 1661 2003 9 2.96796e+01 8.05785e-01 1882 2003 10 2.84948e+01 1.14377e+00 2471 2003 11 2.61767e+01 6.86707e-01 2527 2003 12 2.35396e+01 8.66643e-01 1767 2004 1 2.40004e+01 8.03572e-01 2648 2004 2 2.32343e+01 7.24616e-01 2110 2004 3 2.39734e+01 8.35920e-01 2795 2004 4 2.39559e+01 9.16292e-01 2831 2004 5 2.60115e+01 1.09471e+00 2989 2004 6 2.87331e+01 9.81700e-01 2680 2004 7 2.89479e+01 1.28076e+00 1859 2004 8 2.98732e+01 1.07099e+00 1959 2004 9 2.89991e+01 1.28437e+00 2237 2004 10 2.78563e+01 6.31923e-01 2479 2004 11 2.63300e+01 6.29276e-01 2926 2004 12 2.42718e+01 1.21335e+00 2671 2005 1 2.30619e+01 8.08399e-01 3168 2005 2 2.27261e+01 6.24360e-01 2695 2005 3 2.30905e+01 1.07976e+00 2247 2005 4 2.41793e+01 7.66474e-01 2846 2005 5 2.55758e+01 1.28528e+00 2664 2005 6 2.78486e+01 8.67917e-01 1268 2005 7 2.88979e+01 1.37425e+00 2210 2005 8 3.00357e+01 1.42740e+00 2565 2005 9 2.86101e+01 1.16431e+00 2147 2005 10 2.72203e+01 1.51855e+00 2019 2005 11 2.53782e+01 9.80493e-01 2336 2005 12 2.32452e+01 1.08394e+00 2378 2006 1 2.24881e+01 7.29153e-01 2838 2006 2 2.17853e+01 7.54031e-01 2807 2006 3 2.37056e+01 1.19202e+00 3027 2006 4 2.53569e+01 1.01846e+00 3428 2006 5 2.69686e+01 7.93491e-01 2568 2006 6 2.86650e+01 1.11970e+00 2326 2006 7 2.86976e+01 9.62594e-01 1263 2006 8 2.96285e+01 8.96975e-01 2089 2006 9 3.00685e+01 9.57246e-01 2081 2006 10 2.85095e+01 9.23292e-01 2134 2006 11 2.59006e+01 8.16164e-01 1790 2006 12 2.48664e+01 6.52244e-01 1545 2007 1 2.45601e+01 8.10394e-01 2434 2007 2 2.33113e+01 6.63585e-01 1640 2007 3 2.39927e+01 6.32762e-01 3313 2007 4 2.43327e+01 8.46832e-01 2926 2007 5 2.65849e+01 8.74395e-01 3178 2007 6 2.78541e+01 1.17748e+00 2506 2007 7 2.99902e+01 9.76927e-01 2674 2007 8 3.00103e+01 8.88992e-01 2216 2007 9 3.00492e+01 8.76315e-01 1648 2007 10 2.79441e+01 9.87324e-01 1646 2007 11 2.63308e+01 7.98190e-01 3056 2007 12 2.49807e+01 5.30988e-01 3408 2008 1 2.38436e+01 7.15640e-01 2462 2008 2 2.37954e+01 7.36277e-01 2656 2008 3 2.33393e+01 9.44217e-01 2678 2008 4 2.50895e+01 6.29280e-01 3262 2008 5 2.67507e+01 1.05059e+00 3357 2008 6 2.80423e+01 7.49991e-01 2217 2008 7 2.89670e+01 1.34896e+00 2078 2008 8 2.97442e+01 8.37500e-01 2449 2008 9 2.85579e+01 8.41901e-01 1859 2008 10 2.79267e+01 9.16657e-01 1777 2008 11 2.50164e+01 8.02157e-01 2744 2008 12 2.37938e+01 6.33473e-01 2912 2009 1 2.23223e+01 1.24775e+00 2564 2009 2 2.16919e+01 8.37863e-01 3100 2009 3 2.32034e+01 9.47058e-01 2732 2009 4 2.48251e+01 5.64852e-01 2978 2009 5 2.60877e+01 1.18928e+00 3429 2009 6 2.87897e+01 1.05027e+00 2181 2009 7 2.93351e+01 1.07827e+00 2248 2009 8 2.98174e+01 1.06408e+00 2631 2009 9 3.02720e+01 9.78458e-01 2228 2009 10 2.92609e+01 1.15752e+00 2998 2009 11 2.64168e+01 8.77367e-01 1449 2009 12 2.52190e+01 8.80110e-01 1876 2010 1 2.28380e+01 1.11941e+00 1565 2010 2 2.17587e+01 9.29408e-01 1262 2010 3 2.13420e+01 9.39120e-01 2163 2010 4 2.36975e+01 1.26862e+00 2340 2010 5 2.71107e+01 1.45113e+00 3098 2010 6 3.00996e+01 1.03859e+00 2811 2010 7 2.93641e+01 1.14724e+00 1850 2010 8 3.00173e+01 1.28856e+00 1816 2010 9 2.95513e+01 9.36152e-01 1772 2010 10 2.74736e+01 9.73179e-01 3076 2010 11 2.58436e+01 8.06253e-01 2784 2010 12 2.31124e+01 1.15390e+00 2676 2011 1 2.15074e+01 6.71843e-01 2584 2011 2 2.12013e+01 1.14479e+00 3019 2011 3 2.29992e+01 1.10952e+00 3533 2011 4 2.55294e+01 8.35596e-01 3778 2011 5 2.74555e+01 8.01113e-01 3354 2011 6 2.85856e+01 1.03975e+00 1919 2011 7 3.01293e+01 1.28957e+00 2133 2011 8 3.04111e+01 1.01965e+00 2122 2011 9 2.99764e+01 8.78814e-01 2266 2011 10 2.82626e+01 1.17197e+00 1302 2011 11 2.53569e+01 4.53174e-01 3298 2011 12 2.42853e+01 6.64057e-01 2581 2012 1 2.33080e+01 7.41133e-01 2565 2012 2 2.38508e+01 6.03837e-01 1876 2012 3 2.45586e+01 5.80278e-01 3429 2012 4 2.55547e+01 1.00639e+00 2314 2012 5 2.70150e+01 1.72829e+00 2378 2012 6 2.81017e+01 1.24366e+00 1618 2012 7 2.87481e+01 1.33448e+00 2321 2012 8 3.00308e+01 1.20773e+00 2032 2012 9 2.93282e+01 1.01990e+00 1959 2012 10 2.75310e+01 9.32557e-01 2386 2012 11 2.60869e+01 1.13307e+00 2837 2012 12 2.51108e+01 7.64436e-01 2678 2013 1 2.40626e+01 6.08856e-01 1977 2013 2 2.37397e+01 6.57072e-01 2404 2013 3 2.29449e+01 5.65423e-01 2624 2013 4 2.51996e+01 1.77885e+00 2852 2013 5 2.61987e+01 9.42637e-01 2761 2013 6 2.77736e+01 1.04644e+00 2155 2013 7 2.89037e+01 1.13491e+00 2027 2013 8 2.94591e+01 8.04789e-01 1701 2013 9 2.93539e+01 7.14924e-01 2070 2013 10 2.84707e+01 9.31729e-01 2696 2013 11 2.68221e+01 6.53127e-01 2088 2013 12 2.54804e+01 6.65161e-01 2289 2014 1 2.41372e+01 1.22434e+00 2082 2014 2 2.44907e+01 7.20337e-01 2994 2014 3 2.43694e+01 6.88639e-01 2861 2014 4 2.49181e+01 1.01605e+00 2524 2014 5 2.63640e+01 5.58198e-01 2377 2014 6 2.88119e+01 1.19936e+00 2253 2014 7 3.00551e+01 1.18690e+00 2807 2014 8 3.05363e+01 8.77781e-01 2225 2014 9 3.00393e+01 1.12781e+00 1207 2014 10 2.87578e+01 1.14152e+00 2215 2014 11 2.58916e+01 1.04089e+00 2877 2014 12 2.43869e+01 7.96200e-01 2315 2015 1 2.41953e+01 8.34948e-01 2123 2015 2 2.28408e+01 7.83553e-01 2281 2015 3 2.45763e+01 1.02115e+00 3620 2015 4 2.59510e+01 1.23999e+00 2994 2015 5 2.70650e+01 1.18360e+00 2868 2015 6 2.88075e+01 1.13951e+00 2240 2015 7 2.97467e+01 1.40469e+00 2267 2015 8 3.06521e+01 1.00294e+00 1853 2015 9 3.04706e+01 1.39120e+00 1691 2015 10 2.81990e+01 1.10352e+00 2280 2015 11 2.72959e+01 7.56906e-01 2824 2015 12 2.57303e+01 9.20204e-01 1995 2016 1 2.49278e+01 8.54857e-01 824 2016 2 2.35895e+01 7.60249e-01 1644 2016 3 2.47026e+01 1.30908e+00 1663 2016 4 2.58037e+01 6.88396e-01 3095 2016 5 2.76494e+01 1.11460e+00 2798 2016 6 2.84758e+01 1.03801e+00 2347 2016 7 2.96405e+01 1.06209e+00 2943 2016 8 2.98044e+01 7.24150e-01 1821 2016 9 2.98077e+01 9.27322e-01 2638 2016 10 2.86836e+01 1.01090e+00 2327 2016 11 2.69445e+01 8.67043e-01 3058 2016 12 2.53611e+01 8.32505e-01 2746 2017 1 2.43557e+01 7.92285e-01 3013 2017 2 2.38114e+01 5.74033e-01 3149 2017 3 2.43576e+01 8.94739e-01 3527 2017 4 2.53745e+01 8.27137e-01 2183 2017 5 2.68105e+01 1.13017e+00 2914 2017 6 2.83123e+01 1.17906e+00 1908 2017 7 2.96673e+01 8.08772e-01 2070 2017 8 3.03318e+01 7.97809e-01 2187 2017 9 3.00587e+01 8.34596e-01 1838 2017 10 2.82113e+01 1.15914e+00 1765 2017 11 2.62129e+01 6.56920e-01 3694 2017 12 2.51091e+01 7.69153e-01 3400 2018 1 2.29744e+01 1.35901e+00 1744 2018 2 2.38712e+01 1.13954e+00 2854 2018 3 2.47708e+01 6.91460e-01 3424 2018 4 2.56766e+01 8.09658e-01 3396 2018 5 2.59437e+01 6.03954e-01 1058 2018 6 2.86694e+01 1.51039e+00 1888 2018 7 3.00275e+01 1.44678e+00 2506 2018 8 2.99620e+01 1.12258e+00 2337 2018 9 2.96083e+01 9.27979e-01 2041 2018 10 2.81798e+01 6.34897e-01 3034 2018 11 2.68538e+01 5.97224e-01 1921 2018 12 2.51123e+01 1.00948e+00 2293 2019 1 2.37142e+01 1.16311e+00 2501 2019 2 2.49447e+01 1.08279e+00 3283 2019 3 2.52836e+01 7.52206e-01 3239 2019 4 2.61618e+01 7.26154e-01 3000 2019 5 2.73439e+01 1.02582e+00 3250 2019 6 2.93185e+01 1.34915e+00 2937 2019 7 2.97928e+01 1.20209e+00 2221 2019 8 3.04905e+01 1.20817e+00 1887 2019 9 2.93564e+01 8.51017e-01 2750 2019 10 2.85196e+01 1.07848e+00 2939 2019 11 2.72656e+01 1.08561e+00 2566 2019 12 2.50832e+01 9.04028e-01 2055 2020 1 2.43997e+01 9.16371e-01 2917 2020 2 2.42343e+01 8.36295e-01 2355 2020 3 2.50053e+01 7.30147e-01 4072 2020 4 2.66776e+01 7.80898e-01 2617 2020 5 2.69664e+01 1.31150e+00 2161 2020 6 2.92892e+01 8.33041e-01 1662 2020 7 2.98950e+01 1.16122e+00 1920 2020 8 3.03637e+01 9.54069e-01 2344 2020 9 2.96805e+01 1.08504e+00 2303 2020 10 2.87474e+01 9.95527e-01 1681 2020 11 2.67197e+01 7.83380e-01 2399 2020 12 2.48731e+01 9.32501e-01 2215 2021 1 2.30042e+01 8.44032e-01 2361 2021 2 2.30619e+01 1.19739e+00 2784 2021 3 2.42847e+01 6.87827e-01 3575 2021 4 2.51016e+01 8.04933e-01 3107 2021 5 2.70636e+01 1.00566e+00 2672 2021 6 2.82456e+01 1.07086e+00 1259 2021 7 2.92120e+01 1.09356e+00 2994 2021 8 2.98346e+01 1.07632e+00 1756 2021 9 3.00799e+01 8.75440e-01 2572 2021 10 2.88921e+01 1.11792e+00 2346 2021 11 2.60633e+01 8.95205e-01 1677 2021 12 2.56513e+01 5.39197e-01 3446 2022 1 2.44883e+01 7.13911e-01 2100 2022 2 2.39802e+01 7.39947e-01 2572 2022 3 2.51524e+01 7.62083e-01 3629 2022 4 2.54765e+01 6.96563e-01 1968 2022 5 2.70440e+01 1.02095e+00 2670 2022 6 2.90273e+01 1.56372e+00 1923 2022 7 3.00288e+01 9.18749e-01 2591 2022 8 3.02283e+01 8.55921e-01 2593 2022 9 3.06800e+01 1.15044e+00 2210 2022 10 2.80114e+01 8.68870e-01 2800 2022 11 2.70494e+01 6.18981e-01 2498 2022 12 2.60510e+01 6.51384e-01 2816 2023 1 2.44808e+01 9.18338e-01 3300 2023 2 2.48383e+01 6.96250e-01 3293 2023 3 2.56006e+01 6.64858e-01 3268 2023 4 2.65729e+01 7.34384e-01 3096 2023 5 2.80210e+01 1.19459e+00 3533 2023 6 2.91745e+01 1.01673e+00 2878 2023 7 3.06883e+01 1.05080e+00 2342 2023 8 3.12016e+01 1.13809e+00 2031 2023 9 3.04276e+01 9.21037e-01 2564 2023 10 2.88320e+01 1.35005e+00 2373 2023 11 2.72109e+01 7.54968e-01 2191 2023 12 2.58673e+01 1.37126e+00 1210 2024 1 2.47381e+01 6.79112e-01 1770 2024 2 2.29120e+01 6.99139e-01 2289 2024 3 2.46255e+01 8.93449e-01 2441 2024 4 2.46159e+01 4.34720e-01 322