YEAR MONTH MEAN STDEV COUNT 2000 1 nan nan 0 2000 2 2.36768e+01 2.53913e-01 176 2000 3 2.43956e+01 5.30384e-01 451 2000 4 2.53207e+01 1.10838e+00 546 2000 5 2.70238e+01 1.09909e+00 390 2000 6 2.72111e+01 1.89333e+00 188 2000 7 2.99446e+01 1.41179e+00 517 2000 8 3.01553e+01 7.99225e-01 248 2000 9 2.93343e+01 1.36547e+00 423 2000 10 2.72211e+01 8.56856e-01 748 2000 11 2.57074e+01 8.63144e-01 538 2000 12 2.41801e+01 6.67043e-01 448 2001 1 2.19597e+01 8.05360e-01 355 2001 2 2.34119e+01 9.93923e-01 839 2001 3 2.39153e+01 7.75239e-01 768 2001 4 2.52373e+01 1.45694e+00 751 2001 5 2.58447e+01 7.83253e-01 322 2001 6 2.93919e+01 5.83044e-01 128 2001 7 2.75081e+01 1.70386e+00 566 2001 8 2.91152e+01 8.98421e-01 613 2001 9 2.90061e+01 1.00161e+00 310 2001 10 2.72119e+01 1.27775e+00 446 2001 11 2.54968e+01 7.70765e-01 390 2001 12 2.50589e+01 6.30702e-01 469 2002 1 2.26468e+01 1.11270e+00 448 2002 2 2.37952e+01 5.34340e-01 134 2002 3 2.46926e+01 8.73689e-01 435 2002 4 2.67942e+01 5.94615e-01 537 2002 5 2.69462e+01 1.07711e+00 675 2002 6 2.83518e+01 1.02153e+00 202 2002 7 2.94124e+01 1.01150e+00 2185 2002 8 2.97938e+01 1.01871e+00 1708 2002 9 2.88389e+01 9.43672e-01 1647 2002 10 2.81845e+01 7.60758e-01 2911 2002 11 2.65423e+01 1.56761e+00 2087 2002 12 2.40422e+01 9.87843e-01 2055 2003 1 2.16685e+01 1.54266e+00 1696 2003 2 2.21372e+01 1.26623e+00 2531 2003 3 2.62462e+01 9.25471e-01 2462 2003 4 2.50600e+01 1.26570e+00 2177 2003 5 2.79101e+01 1.08780e+00 2679 2003 6 2.91548e+01 1.00821e+00 1552 2003 7 2.92125e+01 1.13257e+00 1715 2003 8 2.98726e+01 7.94031e-01 1431 2003 9 2.96560e+01 1.03217e+00 1329 2003 10 2.84820e+01 1.19347e+00 2568 2003 11 2.64103e+01 7.16775e-01 2003 2003 12 2.39087e+01 1.06252e+00 1531 2004 1 2.29121e+01 9.93518e-01 2423 2004 2 2.27471e+01 7.53639e-01 1982 2004 3 2.41158e+01 9.91856e-01 2396 2004 4 2.41387e+01 9.65208e-01 2443 2004 5 2.61873e+01 1.14357e+00 2618 2004 6 2.88726e+01 1.27759e+00 2182 2004 7 2.93930e+01 1.23394e+00 2354 2004 8 3.01695e+01 1.11785e+00 2144 2004 9 2.93106e+01 1.27564e+00 1791 2004 10 2.77215e+01 9.23743e-01 2394 2004 11 2.62248e+01 8.13122e-01 2203 2004 12 2.45883e+01 1.01584e+00 1806 2005 1 2.29656e+01 8.24875e-01 2611 2005 2 2.27265e+01 9.05037e-01 1960 2005 3 2.34614e+01 1.46259e+00 2183 2005 4 2.44547e+01 8.20959e-01 2510 2005 5 2.62421e+01 1.74132e+00 2554 2005 6 2.82734e+01 8.94800e-01 1709 2005 7 2.93098e+01 1.00298e+00 2090 2005 8 3.05116e+01 1.15876e+00 2655 2005 9 2.95651e+01 1.18843e+00 2379 2005 10 2.78384e+01 9.49470e-01 1418 2005 11 2.50248e+01 9.57989e-01 2419 2005 12 2.35697e+01 1.10363e+00 2311 2006 1 2.20511e+01 1.29280e+00 2130 2006 2 2.25096e+01 1.13530e+00 2206 2006 3 2.40829e+01 1.17389e+00 3023 2006 4 2.57505e+01 1.34205e+00 3305 2006 5 2.72195e+01 1.04198e+00 2596 2006 6 2.89378e+01 1.08947e+00 2089 2006 7 2.90216e+01 1.08742e+00 1415 2006 8 3.00137e+01 7.85997e-01 1938 2006 9 3.00682e+01 7.69533e-01 2173 2006 10 2.86018e+01 9.37429e-01 2356 2006 11 2.54917e+01 9.10865e-01 1471 2006 12 2.43602e+01 8.82197e-01 998 2007 1 2.46096e+01 9.47004e-01 1992 2007 2 2.28088e+01 8.72772e-01 1377 2007 3 2.40705e+01 6.96196e-01 1938 2007 4 2.47319e+01 8.25943e-01 3168 2007 5 2.68746e+01 1.07717e+00 2382 2007 6 2.81513e+01 1.45999e+00 2088 2007 7 3.04517e+01 8.00258e-01 2463 2007 8 3.01705e+01 9.13626e-01 2702 2007 9 2.99614e+01 7.50920e-01 1995 2007 10 2.80546e+01 8.96990e-01 1588 2007 11 2.61457e+01 8.17757e-01 2280 2007 12 2.50571e+01 6.77088e-01 2774 2008 1 2.35488e+01 8.54547e-01 1956 2008 2 2.42787e+01 1.14597e+00 2466 2008 3 2.36300e+01 9.70901e-01 1914 2008 4 2.53200e+01 6.60262e-01 3140 2008 5 2.70818e+01 1.20157e+00 3186 2008 6 2.82848e+01 8.88594e-01 2134 2008 7 2.90741e+01 9.83394e-01 1993 2008 8 2.99974e+01 1.04904e+00 2212 2008 9 2.88142e+01 6.69801e-01 1618 2008 10 2.78757e+01 1.11382e+00 1747 2008 11 2.51050e+01 8.58357e-01 2431 2008 12 2.36152e+01 6.00516e-01 2193 2009 1 2.23833e+01 1.24145e+00 2499 2009 2 2.20573e+01 1.18737e+00 2381 2009 3 2.33854e+01 1.10790e+00 1801 2009 4 2.51526e+01 7.54442e-01 2655 2009 5 2.66238e+01 1.44080e+00 3284 2009 6 2.98029e+01 1.32127e+00 1730 2009 7 3.00591e+01 7.75890e-01 2522 2009 8 2.98355e+01 7.07473e-01 2427 2009 9 2.99901e+01 9.52706e-01 1832 2009 10 2.90634e+01 1.33326e+00 2256 2009 11 2.67429e+01 8.76120e-01 1722 2009 12 2.48414e+01 1.25259e+00 2263 2010 1 2.24828e+01 1.37259e+00 1376 2010 2 2.11390e+01 1.46174e+00 1292 2010 3 2.08178e+01 1.43191e+00 2240 2010 4 2.41436e+01 1.48621e+00 1844 2010 5 2.72851e+01 1.11325e+00 2867 2010 6 3.03379e+01 9.38363e-01 2552 2010 7 2.92948e+01 9.15437e-01 1481 2010 8 3.06373e+01 1.19147e+00 1659 2010 9 2.95216e+01 1.03915e+00 1788 2010 10 2.73472e+01 9.61818e-01 2558 2010 11 2.56870e+01 7.63701e-01 2261 2010 12 2.30578e+01 1.35191e+00 2238 2011 1 2.14008e+01 9.40624e-01 2136 2011 2 2.18545e+01 1.02791e+00 2825 2011 3 2.38589e+01 9.10852e-01 3172 2011 4 2.64019e+01 7.49483e-01 3376 2011 5 2.78856e+01 8.62594e-01 3013 2011 6 2.85613e+01 1.09746e+00 2196 2011 7 2.98074e+01 1.28242e+00 1735 2011 8 3.02566e+01 1.05644e+00 1992 2011 9 3.00427e+01 1.06975e+00 2237 2011 10 2.75814e+01 1.43395e+00 1071 2011 11 2.54860e+01 5.88522e-01 2758 2011 12 2.42513e+01 7.27191e-01 2335 2012 1 2.25963e+01 8.88750e-01 2052 2012 2 2.40314e+01 5.57995e-01 1781 2012 3 2.48584e+01 5.69253e-01 2586 2012 4 2.57723e+01 1.02195e+00 2235 2012 5 2.70174e+01 1.74035e+00 1672 2012 6 2.82781e+01 1.16572e+00 1665 2012 7 2.90787e+01 9.70744e-01 2317 2012 8 2.98776e+01 9.41110e-01 2151 2012 9 2.95421e+01 9.04537e-01 1759 2012 10 2.81154e+01 8.93840e-01 2278 2012 11 2.62363e+01 1.00762e+00 2182 2012 12 2.48390e+01 9.11860e-01 1856 2013 1 2.37699e+01 7.28172e-01 1597 2013 2 2.39527e+01 6.64888e-01 2253 2013 3 2.32785e+01 9.46935e-01 2363 2013 4 2.58439e+01 1.43714e+00 2520 2013 5 2.68366e+01 8.82258e-01 2807 2013 6 2.82975e+01 1.22133e+00 1600 2013 7 2.91289e+01 1.05565e+00 1864 2013 8 2.95383e+01 9.57005e-01 1205 2013 9 2.93458e+01 9.15352e-01 1378 2013 10 2.86407e+01 7.34386e-01 2398 2013 11 2.68092e+01 9.48738e-01 1803 2013 12 2.53299e+01 7.84671e-01 2202 2014 1 2.40113e+01 1.33741e+00 1685 2014 2 2.46575e+01 8.25017e-01 2696 2014 3 2.45533e+01 9.29845e-01 2593 2014 4 2.57683e+01 9.51518e-01 2676 2014 5 2.68658e+01 7.15740e-01 2195 2014 6 2.93024e+01 1.50901e+00 1968 2014 7 3.00156e+01 1.12933e+00 2219 2014 8 3.08269e+01 9.93825e-01 2606 2014 9 2.97901e+01 1.17672e+00 1302 2014 10 2.84456e+01 1.39458e+00 2303 2014 11 2.58877e+01 6.71619e-01 2128 2014 12 2.48939e+01 8.27917e-01 2372 2015 1 2.42044e+01 1.26761e+00 1510 2015 2 2.27093e+01 1.11935e+00 2190 2015 3 2.52388e+01 1.32471e+00 3077 2015 4 2.65421e+01 1.60228e+00 2847 2015 5 2.73929e+01 1.04329e+00 2947 2015 6 2.92680e+01 1.07284e+00 2103 2015 7 2.99727e+01 1.02179e+00 2206 2015 8 3.08089e+01 7.89180e-01 2287 2015 9 3.05863e+01 1.27365e+00 1411 2015 10 2.84873e+01 1.12740e+00 1892 2015 11 2.73834e+01 1.09459e+00 2637 2015 12 2.57631e+01 6.38314e-01 1687 2016 1 2.50964e+01 1.24185e+00 756 2016 2 2.28786e+01 1.15457e+00 1522 2016 3 2.46661e+01 1.49464e+00 1676 2016 4 2.58873e+01 1.12030e+00 2621 2016 5 2.76421e+01 1.32665e+00 2988 2016 6 2.92900e+01 8.73947e-01 2198 2016 7 3.01669e+01 8.60888e-01 2418 2016 8 3.01326e+01 9.99365e-01 1524 2016 9 2.99177e+01 1.15300e+00 2389 2016 10 2.88510e+01 8.44505e-01 1834 2016 11 2.65093e+01 1.19836e+00 2634 2016 12 2.57341e+01 5.76897e-01 2338 2017 1 2.42223e+01 8.24638e-01 2238 2017 2 2.38443e+01 6.60980e-01 2833 2017 3 2.42810e+01 1.00969e+00 2790 2017 4 2.55524e+01 1.07223e+00 1965 2017 5 2.72856e+01 9.99853e-01 2448 2017 6 2.90688e+01 1.09948e+00 1553 2017 7 2.98739e+01 6.87896e-01 2311 2017 8 3.06927e+01 1.13088e+00 2417 2017 9 2.97313e+01 9.42065e-01 2096 2017 10 2.86085e+01 9.06109e-01 1507 2017 11 2.60742e+01 6.51149e-01 3145 2017 12 2.43657e+01 1.16793e+00 3250 2018 1 2.22961e+01 1.45331e+00 1167 2018 2 2.43911e+01 9.51229e-01 2911 2018 3 2.45198e+01 1.02789e+00 3003 2018 4 2.61046e+01 1.16909e+00 2788 2018 5 2.58993e+01 1.01920e+00 1118 2018 6 2.92398e+01 1.31560e+00 1640 2018 7 3.05413e+01 1.38630e+00 1749 2018 8 2.98756e+01 9.86231e-01 2576 2018 9 3.01147e+01 9.86230e-01 2298 2018 10 2.82266e+01 7.57007e-01 2851 2018 11 2.67870e+01 8.64276e-01 2021 2018 12 2.47845e+01 1.41422e+00 2134 2019 1 2.37438e+01 1.14983e+00 1957 2019 2 2.51405e+01 1.01475e+00 2828 2019 3 2.56249e+01 9.48989e-01 2844 2019 4 2.63312e+01 8.36108e-01 2851 2019 5 2.82039e+01 1.00699e+00 2923 2019 6 2.99273e+01 1.27542e+00 2759 2019 7 3.04347e+01 9.46957e-01 2213 2019 8 3.06325e+01 1.13647e+00 2005 2019 9 2.92355e+01 1.07535e+00 2304 2019 10 2.84123e+01 8.26488e-01 2076 2019 11 2.72235e+01 1.03781e+00 2531 2019 12 2.51525e+01 8.60879e-01 1792 2020 1 2.43990e+01 8.95499e-01 2299 2020 2 2.44926e+01 1.02725e+00 2215 2020 3 2.52259e+01 7.47466e-01 3342 2020 4 2.74765e+01 1.23249e+00 2853 2020 5 2.71236e+01 1.11670e+00 1739 2020 6 2.95705e+01 9.26005e-01 1609 2020 7 3.01374e+01 1.10304e+00 2140 2020 8 3.05694e+01 1.23636e+00 2276 2020 9 3.01500e+01 1.00686e+00 1851 2020 10 2.88038e+01 1.36818e+00 1355 2020 11 2.67344e+01 8.42491e-01 1883 2020 12 2.42292e+01 1.22359e+00 2306 2021 1 2.31911e+01 8.85743e-01 2141 2021 2 2.38468e+01 1.64967e+00 2588 2021 3 2.47540e+01 6.83912e-01 3179 2021 4 2.57617e+01 1.08338e+00 2618 2021 5 2.75790e+01 1.15835e+00 2951 2021 6 2.82794e+01 1.04362e+00 1288 2021 7 2.96787e+01 1.26279e+00 2573 2021 8 3.03122e+01 1.03674e+00 1964 2021 9 3.01051e+01 1.05821e+00 3154 2021 10 2.90277e+01 9.80632e-01 1932 2021 11 2.60618e+01 9.14898e-01 2060 2021 12 2.54872e+01 6.62444e-01 2614 2022 1 2.41092e+01 1.25720e+00 1828 2022 2 2.40615e+01 8.00205e-01 2590 2022 3 2.55226e+01 7.19493e-01 3160 2022 4 2.60962e+01 7.12878e-01 1641 2022 5 2.76144e+01 1.00659e+00 2488 2022 6 2.91395e+01 1.29349e+00 1993 2022 7 2.98843e+01 8.68160e-01 2118 2022 8 3.00137e+01 1.06040e+00 2333 2022 9 3.07904e+01 8.84714e-01 2345 2022 10 2.78626e+01 8.49546e-01 2355 2022 11 2.72274e+01 5.76844e-01 2580 2022 12 2.58398e+01 8.55621e-01 2733 2023 1 2.43535e+01 1.00946e+00 3236 2023 2 2.48519e+01 8.51543e-01 3471 2023 3 2.53702e+01 8.01702e-01 2864 2023 4 2.69818e+01 8.73512e-01 2648 2023 5 2.83071e+01 1.13492e+00 2748 2023 6 2.99574e+01 1.03625e+00 1894 2023 7 3.12671e+01 1.12510e+00 2448 2023 8 3.10677e+01 7.99029e-01 2222 2023 9 3.07661e+01 7.77128e-01 2122 2023 10 2.89565e+01 1.20766e+00 2783 2023 11 2.70623e+01 8.33004e-01 2401 2023 12 2.52204e+01 1.18379e+00 1315 2024 1 2.42956e+01 9.21811e-01 1586 2024 2 2.26596e+01 8.27317e-01 2626 2024 3 2.53430e+01 8.81497e-01 2118 2024 4 2.44704e+01 5.33535e-01 295