YEAR MONTH MEAN STDEV COUNT 2002 1 nan nan 0 2002 2 nan nan 0 2002 3 nan nan 0 2002 4 nan nan 0 2002 5 nan nan 0 2002 6 nan nan 0 2002 7 5.89350e+01 1.24125e-01 73 2002 8 5.82035e+01 4.35945e-01 267 2002 9 5.69916e+01 2.70634e-02 93 2002 10 4.99214e+01 1.63924e+00 374 2002 11 4.39551e+01 1.64718e+00 772 2002 12 4.05770e+01 3.46200e-01 652 2003 1 4.28150e+01 1.13624e+00 463 2003 2 4.84131e+01 1.68615e+00 461 2003 3 5.43588e+01 1.77872e+00 399 2003 4 5.83340e+01 8.29304e-01 155 2003 5 5.93600e+01 8.85804e-02 154 2003 6 5.94936e+01 5.33878e-03 54 2003 7 5.88116e+01 4.46447e-03 32 2003 8 5.84320e+01 5.07854e-01 263 2003 9 5.51089e+01 1.14351e+00 282 2003 10 5.05241e+01 1.21650e+00 416 2003 11 4.28000e+01 1.24023e+00 330 2003 12 4.06214e+01 4.55538e-01 534 2004 1 4.17685e+01 9.50387e-01 547 2004 2 4.79256e+01 1.97014e+00 830 2004 3 5.45083e+01 1.70873e+00 506 2004 4 5.86776e+01 6.61883e-01 493 2004 5 5.95617e+01 1.06176e-01 228 2004 6 5.96562e+01 9.19241e-02 135 2004 7 5.89799e+01 2.98633e-01 109 2004 8 5.81482e+01 6.72752e-01 255 2004 9 5.49007e+01 8.83286e-01 181 2004 10 4.95993e+01 1.55426e+00 297 2004 11 4.31482e+01 1.66336e+00 447 2004 12 4.05606e+01 3.74597e-01 785 2005 1 4.21003e+01 1.35168e+00 623 2005 2 4.85260e+01 1.82349e+00 423 2005 3 5.50872e+01 1.48750e+00 522 2005 4 5.90449e+01 5.76173e-01 311 2005 5 5.95338e+01 8.04908e-02 164 2005 6 nan nan 0 2005 7 5.84964e+01 2.15894e-01 69 2005 8 5.73616e+01 2.20369e-03 64 2005 9 5.56218e+01 2.25873e-02 109 2005 10 4.99064e+01 2.29738e+00 204 2005 11 4.38183e+01 1.34942e+00 451 2005 12 4.06145e+01 3.14045e-01 1010 2006 1 4.25666e+01 1.29060e+00 687 2006 2 4.89675e+01 1.78430e+00 807 2006 3 5.47847e+01 1.23731e+00 311 2006 4 5.83674e+01 7.59996e-01 237 2006 5 5.94773e+01 1.17124e-01 247 2006 6 5.96189e+01 1.29481e-01 53 2006 7 5.90894e+01 3.17319e-01 205 2006 8 5.90107e+01 3.30790e-03 8 2006 9 5.44457e+01 7.32369e-01 216 2006 10 4.99203e+01 1.80184e+00 165 2006 11 4.44457e+01 1.55143e+00 700 2006 12 4.05273e+01 3.29146e-01 728 2007 1 4.22223e+01 1.54111e+00 1078 2007 2 4.87782e+01 1.77267e+00 658 2007 3 5.46779e+01 1.78906e+00 391 2007 4 5.83766e+01 6.80407e-01 248 2007 5 5.95096e+01 1.82463e-01 106 2007 6 5.96829e+01 9.03754e-02 61 2007 7 5.90934e+01 4.05389e-01 174 2007 8 5.83417e+01 4.47287e-01 235 2007 9 5.73253e+01 1.09978e-01 67 2007 10 4.97913e+01 1.10432e+00 279 2007 11 4.33684e+01 1.34416e+00 438 2007 12 4.05412e+01 3.10064e-01 676 2008 1 4.20490e+01 1.29827e+00 840 2008 2 4.86666e+01 1.83870e+00 539 2008 3 5.45118e+01 1.48523e+00 501 2008 4 5.87278e+01 4.50317e-01 309 2008 5 5.95362e+01 1.24485e-01 421 2008 6 5.96827e+01 4.70489e-02 148 2008 7 5.88462e+01 1.63942e-01 233 2008 8 5.88014e+01 2.44886e-01 184 2008 9 5.50626e+01 1.00500e+00 200 2008 10 4.94618e+01 2.23679e+00 432 2008 11 4.38385e+01 1.49777e+00 612 2008 12 4.04878e+01 1.60203e-01 677 2009 1 4.24852e+01 1.57320e+00 960 2009 2 4.81032e+01 1.78579e+00 692 2009 3 5.49728e+01 1.62174e+00 462 2009 4 5.83356e+01 5.51523e-01 416 2009 5 5.94182e+01 1.60303e-01 136 2009 6 5.95555e+01 6.23482e-02 149 2009 7 5.90649e+01 2.76762e-01 202 2009 8 5.81870e+01 6.07642e-01 160 2009 9 5.47443e+01 1.37993e+00 179 2009 10 5.01994e+01 1.76856e+00 495 2009 11 4.39919e+01 1.63878e+00 658 2009 12 4.07089e+01 4.11086e-01 753 2010 1 4.24907e+01 1.28728e+00 681 2010 2 4.73052e+01 1.37676e+00 503 2010 3 5.56440e+01 1.11283e+00 337 2010 4 5.80199e+01 4.18481e-01 187 2010 5 5.97022e+01 4.79532e-02 94 2010 6 5.96085e+01 1.07070e-01 246 2010 7 5.88291e+01 2.12145e-01 55 2010 8 5.83640e+01 4.14581e-01 222 2010 9 5.67270e+01 4.97479e-01 156 2010 10 4.90788e+01 8.76918e-01 261 2010 11 4.34270e+01 1.10074e+00 374 2010 12 4.07694e+01 4.46395e-01 502 2011 1 4.32404e+01 1.09448e+00 580 2011 2 4.82425e+01 1.82465e+00 668 2011 3 5.47194e+01 1.69849e+00 462 2011 4 5.85612e+01 6.93876e-01 331 2011 5 5.93949e+01 1.04670e-01 116 2011 6 5.95722e+01 8.74224e-02 78 2011 7 5.87621e+01 1.35500e-01 116 2011 8 5.82198e+01 7.12748e-01 65 2011 9 5.62164e+01 1.12481e+00 276 2011 10 4.85854e+01 1.15220e+00 250 2011 11 4.29699e+01 8.86041e-01 532 2011 12 4.06907e+01 3.20983e-01 714 2012 1 4.21016e+01 1.34389e+00 828 2012 2 4.85620e+01 1.84280e+00 723 2012 3 5.37107e+01 1.13649e+00 270 2012 4 5.85490e+01 5.55478e-01 206 2012 5 5.93252e+01 1.21152e-01 186 2012 6 5.97317e+01 3.45549e-02 59 2012 7 5.88483e+01 9.63807e-02 173 2012 8 5.88813e+01 9.57789e-04 14 2012 9 5.61606e+01 1.02357e+00 354 2012 10 5.04047e+01 2.76659e+00 208 2012 11 4.41126e+01 1.62804e+00 613 2012 12 4.05423e+01 1.77417e-01 681 2013 1 4.24347e+01 1.45872e+00 735 2013 2 4.90635e+01 2.04591e+00 726 2013 3 5.48249e+01 1.15233e+00 433 2013 4 5.89661e+01 5.35090e-01 338 2013 5 5.94143e+01 1.24397e-01 218 2013 6 nan nan 0 2013 7 5.88951e+01 2.04554e-01 392 2013 8 5.85226e+01 7.50000e-01 166 2013 9 5.47326e+01 8.03752e-01 248 2013 10 5.04773e+01 1.93622e+00 242 2013 11 4.30613e+01 1.14924e+00 561 2013 12 4.05579e+01 3.27989e-01 552 2014 1 4.27664e+01 1.63965e+00 823 2014 2 4.80930e+01 1.77271e+00 818 2014 3 5.51080e+01 1.62280e+00 424 2014 4 5.84931e+01 8.87378e-01 204 2014 5 5.94266e+01 1.91372e-01 300 2014 6 5.95821e+01 1.17241e-01 145 2014 7 5.88899e+01 1.92419e-01 186 2014 8 5.91140e+01 1.09076e-02 67 2014 9 5.60120e+01 1.43868e+00 99 2014 10 5.00656e+01 1.81155e+00 632 2014 11 4.30341e+01 1.05441e+00 735 2014 12 4.05764e+01 2.97555e-01 929 2015 1 4.21816e+01 1.43816e+00 802 2015 2 4.82323e+01 2.33566e+00 602 2015 3 5.48266e+01 1.57375e+00 472 2015 4 5.86769e+01 7.07702e-01 417 2015 5 nan nan 0 2015 6 nan nan 0 2015 7 5.87070e+01 4.32095e-03 48 2015 8 5.87201e+01 2.62912e-01 350 2015 9 5.52996e+01 1.38024e+00 424 2015 10 4.90873e+01 1.57960e+00 517 2015 11 4.45963e+01 1.32855e+00 220 2015 12 4.06167e+01 3.57288e-01 743 2016 1 4.24284e+01 1.41810e+00 666 2016 2 4.89046e+01 1.91706e+00 525 2016 3 5.47389e+01 1.80059e+00 193 2016 4 5.86628e+01 3.31399e-01 206 2016 5 5.95330e+01 1.62347e-02 56 2016 6 5.95655e+01 4.08564e-02 190 2016 7 5.89889e+01 1.20141e-01 77 2016 8 5.83572e+01 2.85072e-01 248 2016 9 5.55741e+01 1.12714e+00 444 2016 10 4.88238e+01 1.42997e+00 289 2016 11 4.37162e+01 1.84203e+00 219 2016 12 4.06087e+01 2.74786e-01 747 2017 1 4.22923e+01 1.40989e+00 432 2017 2 4.81804e+01 1.52015e+00 661 2017 3 5.44069e+01 1.62125e+00 504 2017 4 5.82550e+01 6.01637e-01 418 2017 5 5.93734e+01 1.76391e-01 247 2017 6 5.96503e+01 6.76790e-02 236 2017 7 5.88842e+01 6.95550e-02 162 2017 8 5.84577e+01 6.02970e-01 123 2017 9 5.60947e+01 1.28799e+00 282 2017 10 5.03589e+01 1.56685e+00 221 2017 11 4.37290e+01 1.95045e+00 479 2017 12 4.05063e+01 2.99705e-01 968 2018 1 4.27384e+01 1.39626e+00 632 2018 2 4.87329e+01 1.97731e+00 522 2018 3 5.39919e+01 1.51096e+00 546 2018 4 5.84619e+01 7.94949e-01 232 2018 5 5.96083e+01 1.60281e-01 227 2018 6 5.96258e+01 1.11541e-01 262 2018 7 5.88598e+01 4.76610e-02 49 2018 8 5.82933e+01 4.24789e-01 298 2018 9 5.55139e+01 1.35606e+00 320 2018 10 4.83772e+01 1.00324e+00 376 2018 11 4.35876e+01 1.42714e+00 872 2018 12 4.06660e+01 2.85001e-01 661 2019 1 4.21728e+01 1.40321e+00 1069 2019 2 4.86590e+01 1.95765e+00 601 2019 3 5.49928e+01 1.41632e+00 613 2019 4 5.90113e+01 4.77203e-01 269 2019 5 5.95010e+01 3.53332e-02 43 2019 6 5.96686e+01 1.19358e-01 162 2019 7 5.89146e+01 1.27564e-01 173 2019 8 5.79160e+01 3.34527e-01 185 2019 9 5.58219e+01 1.18588e+00 137 2019 10 5.00999e+01 2.37219e+00 371 2019 11 4.39430e+01 1.69464e+00 734 2019 12 4.06696e+01 3.65842e-01 630 2020 1 4.23973e+01 1.54271e+00 778 2020 2 4.80727e+01 1.84850e+00 582 2020 3 5.45061e+01 1.97721e+00 327 2020 4 5.86015e+01 7.59314e-01 724 2020 5 5.94184e+01 1.79297e-01 210 2020 6 5.96342e+01 8.48602e-02 274 2020 7 5.90278e+01 2.62141e-01 293 2020 8 5.89979e+01 4.83113e-02 141 2020 9 5.54911e+01 1.01307e+00 257 2020 10 4.93287e+01 1.17488e+00 424 2020 11 4.31823e+01 1.52935e+00 503 2020 12 4.05508e+01 3.57349e-01 741 2021 1 4.23335e+01 1.14057e+00 776 2021 2 4.93494e+01 1.49693e+00 400 2021 3 5.51476e+01 1.42389e+00 559 2021 4 5.89608e+01 6.00626e-01 365 2021 5 5.94651e+01 1.42321e-01 252 2021 6 5.94669e+01 5.35611e-03 13 2021 7 5.91277e+01 3.34173e-01 181 2021 8 5.86582e+01 3.96283e-01 324 2021 9 5.52854e+01 1.32689e+00 316 2021 10 5.08879e+01 2.06268e+00 202 2021 11 4.44301e+01 1.46523e+00 682 2021 12 4.05918e+01 3.03048e-01 761 2022 1 4.23480e+01 1.42385e+00 910 2022 2 4.85081e+01 1.93534e+00 508 2022 3 5.38179e+01 1.28383e+00 322 2022 4 5.93009e+01 1.61217e-01 108 2022 5 5.94107e+01 8.26349e-02 276 2022 6 5.96239e+01 8.28825e-02 231 2022 7 5.88044e+01 5.73863e-02 176 2022 8 5.81854e+01 3.09064e-01 271 2022 9 5.45614e+01 1.09096e-02 56 2022 10 5.10486e+01 1.36616e+00 442 2022 11 4.33250e+01 1.30109e+00 828 2022 12 4.05934e+01 3.25332e-01 951 2023 1 4.21445e+01 1.32263e+00 1039 2023 2 4.89035e+01 1.82246e+00 693 2023 3 5.46181e+01 1.83689e+00 557 2023 4 5.86299e+01 7.27465e-01 500 2023 5 5.96148e+01 2.81992e-01 350 2023 6 5.95165e+01 1.03575e-01 165 2023 7 nan nan 0 2023 8 5.82758e+01 5.40586e-01 236 2023 9 5.58773e+01 1.10327e+00 403 2023 10 4.98384e+01 1.67338e+00 252 2023 11 4.38946e+01 1.64835e+00 736 2023 12 4.07387e+01 4.30261e-01 678 2024 1 4.21227e+01 1.25832e+00 865 2024 2 4.91335e+01 1.80492e+00 575 2024 3 5.46052e+01 1.58183e+00 450 2024 4 nan nan 0