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 5.92718e+01 8.14388e-02 128 2002 8 5.86634e+01 5.28823e-01 291 2002 9 5.62670e+01 8.90019e-01 268 2002 10 4.98853e+01 2.11838e+00 302 2002 11 4.34355e+01 1.51017e+00 903 2002 12 4.00754e+01 1.84820e-01 860 2003 1 4.23788e+01 1.17637e+00 846 2003 2 4.83405e+01 1.94677e+00 547 2003 3 5.40246e+01 1.83299e+00 635 2003 4 5.85822e+01 7.62909e-01 110 2003 5 6.00894e+01 1.66405e-01 250 2003 6 6.00769e+01 4.89475e-02 64 2003 7 5.91279e+01 5.52146e-02 84 2003 8 5.89631e+01 1.57996e-01 195 2003 9 5.50732e+01 1.63212e+00 195 2003 10 4.99105e+01 1.98725e+00 576 2003 11 4.32253e+01 1.54186e+00 262 2003 12 4.01299e+01 3.96333e-01 645 2004 1 4.21465e+01 1.40735e+00 994 2004 2 4.77500e+01 2.07591e+00 789 2004 3 5.45155e+01 1.68465e+00 564 2004 4 5.88194e+01 8.18588e-01 621 2004 5 6.01135e+01 1.08825e-01 128 2004 6 5.90543e+01 3.40977e-01 156 2004 7 5.89547e+01 2.73260e-01 97 2004 8 5.82616e+01 5.86735e-01 192 2004 9 5.42660e+01 9.23404e-01 284 2004 10 4.96727e+01 1.01047e+00 384 2004 11 4.37469e+01 1.63172e+00 463 2004 12 4.01123e+01 4.06976e-01 523 2005 1 4.30277e+01 1.56258e+00 418 2005 2 4.76714e+01 1.76721e+00 482 2005 3 5.44517e+01 1.60245e+00 759 2005 4 5.86608e+01 8.27593e-01 470 2005 5 5.99581e+01 1.63971e-01 128 2005 6 5.91293e+01 1.05181e-01 64 2005 7 5.91849e+01 7.05067e-02 139 2005 8 5.90509e+01 2.26552e-01 123 2005 9 5.53055e+01 1.25595e+00 387 2005 10 5.12334e+01 2.28650e+00 154 2005 11 4.37034e+01 1.16431e+00 484 2005 12 4.02425e+01 3.72669e-01 751 2006 1 4.27224e+01 1.51180e+00 781 2006 2 4.85367e+01 1.82634e+00 834 2006 3 5.41508e+01 1.90626e+00 416 2006 4 5.91261e+01 6.22947e-01 534 2006 5 6.01432e+01 1.22699e-01 313 2006 6 5.89933e+01 1.21267e-01 71 2006 7 5.90446e+01 1.06813e-01 133 2006 8 5.89732e+01 1.66127e-01 149 2006 9 5.46811e+01 1.18358e+00 441 2006 10 4.86472e+01 1.72300e+00 324 2006 11 4.38858e+01 1.65546e+00 732 2006 12 4.00055e+01 3.10856e-01 713 2007 1 4.20791e+01 1.52354e+00 975 2007 2 4.81807e+01 2.06602e+00 952 2007 3 5.38891e+01 1.88724e+00 237 2007 4 5.90424e+01 6.45050e-01 320 2007 5 6.01184e+01 1.81720e-01 179 2007 6 5.89422e+01 1.12007e-01 188 2007 7 5.90521e+01 2.24955e-01 140 2007 8 5.86386e+01 3.60114e-01 175 2007 9 5.53627e+01 1.14106e+00 344 2007 10 5.00114e+01 1.25273e+00 248 2007 11 4.38982e+01 1.27223e+00 547 2007 12 4.00658e+01 2.67825e-01 555 2008 1 4.22587e+01 1.44559e+00 680 2008 2 4.80847e+01 1.40003e+00 591 2008 3 5.40126e+01 1.95569e+00 322 2008 4 5.91204e+01 5.09585e-01 367 2008 5 6.01355e+01 1.52953e-01 400 2008 6 5.90856e+01 1.17564e-01 140 2008 7 5.92129e+01 2.40020e-01 317 2008 8 5.88082e+01 2.05438e-01 187 2008 9 5.58983e+01 8.28302e-01 256 2008 10 4.83602e+01 1.67925e+00 644 2008 11 4.40228e+01 1.32860e+00 578 2008 12 4.00900e+01 3.09239e-01 590 2009 1 4.23050e+01 1.59286e+00 810 2009 2 4.89904e+01 1.60033e+00 476 2009 3 5.53004e+01 9.03308e-01 324 2009 4 5.85148e+01 6.64016e-01 437 2009 5 6.01514e+01 1.31182e-01 192 2009 6 5.99719e+01 4.17028e-01 73 2009 7 5.90810e+01 1.61497e-01 168 2009 8 5.87883e+01 4.85850e-01 320 2009 9 5.47419e+01 1.17202e+00 469 2009 10 4.92535e+01 1.65729e+00 519 2009 11 4.27796e+01 1.45269e+00 535 2009 12 4.02867e+01 4.47840e-01 820 2010 1 4.21772e+01 1.53804e+00 787 2010 2 4.71894e+01 1.19604e+00 504 2010 3 5.55346e+01 1.59844e+00 546 2010 4 5.80068e+01 5.58709e-01 320 2010 5 6.01059e+01 7.67572e-02 84 2010 6 5.89684e+01 1.07723e-01 128 2010 7 5.90257e+01 2.48942e-01 256 2010 8 5.87244e+01 6.45390e-01 368 2010 9 5.56369e+01 1.12089e+00 271 2010 10 4.93026e+01 1.37234e+00 412 2010 11 4.24920e+01 7.62890e-01 431 2010 12 4.05990e+01 4.64399e-01 611 2011 1 4.31674e+01 1.02796e+00 717 2011 2 4.70144e+01 1.74718e+00 509 2011 3 5.46970e+01 1.35056e+00 523 2011 4 5.87539e+01 8.75551e-01 440 2011 5 6.03210e+01 3.98368e-02 4 2011 6 5.89578e+01 1.30372e-01 128 2011 7 5.90219e+01 1.53317e-01 157 2011 8 5.86717e+01 6.58373e-01 264 2011 9 5.61722e+01 1.69286e+00 258 2011 10 4.90905e+01 1.77486e+00 502 2011 11 4.33200e+01 1.01586e+00 499 2011 12 4.00450e+01 1.24860e-01 496 2012 1 4.17382e+01 1.18964e+00 897 2012 2 4.83793e+01 2.39725e+00 624 2012 3 5.32700e+01 7.99400e-01 305 2012 4 5.88309e+01 5.98300e-01 371 2012 5 6.00527e+01 2.20690e-01 256 2012 6 5.90189e+01 1.44820e-01 165 2012 7 5.91147e+01 1.27162e-01 221 2012 8 5.85121e+01 6.39313e-01 213 2012 9 5.52045e+01 1.14866e+00 287 2012 10 4.91629e+01 1.94124e+00 512 2012 11 4.37151e+01 1.73397e+00 834 2012 12 4.02097e+01 2.70873e-01 700 2013 1 4.15228e+01 9.11541e-01 589 2013 2 4.85381e+01 2.33854e+00 733 2013 3 5.46784e+01 1.51371e+00 625 2013 4 5.85876e+01 6.74663e-01 406 2013 5 6.01624e+01 7.91229e-02 238 2013 6 nan nan 0 2013 7 5.91523e+01 2.51169e-01 257 2013 8 5.88028e+01 3.95909e-01 331 2013 9 5.46165e+01 7.06071e-01 305 2013 10 5.11057e+01 1.21009e+00 223 2013 11 4.40779e+01 8.32909e-01 368 2013 12 4.00621e+01 2.66156e-01 815 2014 1 4.22686e+01 1.53517e+00 897 2014 2 4.79764e+01 1.83809e+00 529 2014 3 5.44690e+01 1.83894e+00 676 2014 4 5.88593e+01 9.16021e-01 406 2014 5 5.99952e+01 1.74285e-01 254 2014 6 5.93111e+01 5.49242e-01 286 2014 7 5.92645e+01 1.57781e-01 160 2014 8 5.90304e+01 3.74316e-01 250 2014 9 5.52590e+01 1.37704e+00 532 2014 10 4.86115e+01 1.81134e+00 585 2014 11 4.29740e+01 8.69681e-01 642 2014 12 4.01068e+01 2.89269e-01 781 2015 1 4.23078e+01 1.56331e+00 883 2015 2 4.76819e+01 1.93078e+00 556 2015 3 5.50358e+01 1.40971e+00 510 2015 4 5.85747e+01 6.62905e-01 451 2015 5 6.01683e+01 9.89551e-02 274 2015 6 5.93488e+01 4.68552e-01 103 2015 7 5.89992e+01 5.75313e-02 128 2015 8 5.91001e+01 2.76789e-01 411 2015 9 5.51356e+01 1.56406e+00 515 2015 10 4.89575e+01 1.16292e+00 601 2015 11 4.33781e+01 1.37387e+00 438 2015 12 4.00072e+01 1.63394e-01 532 2016 1 4.23339e+01 1.04837e+00 530 2016 2 4.78739e+01 2.12599e+00 743 2016 3 5.46364e+01 1.50096e+00 448 2016 4 5.86764e+01 5.54701e-01 421 2016 5 6.01651e+01 1.37921e-01 118 2016 6 5.90892e+01 1.67085e-01 192 2016 7 5.92290e+01 6.04693e-01 235 2016 8 5.90154e+01 2.94148e-01 220 2016 9 5.51240e+01 1.00328e+00 384 2016 10 4.82617e+01 1.27715e+00 192 2016 11 4.33698e+01 1.63303e+00 310 2016 12 4.03029e+01 4.60277e-01 468 2017 1 4.23722e+01 1.24937e+00 666 2017 2 4.83276e+01 1.67963e+00 722 2017 3 5.37789e+01 1.80537e+00 430 2017 4 5.81873e+01 8.81912e-01 203 2017 5 6.00092e+01 1.46493e-01 220 2017 6 5.90376e+01 1.56523e-01 312 2017 7 5.90112e+01 2.01816e-01 420 2017 8 5.86336e+01 5.66684e-01 184 2017 9 5.57406e+01 1.59031e+00 275 2017 10 4.75970e+01 9.21565e-01 192 2017 11 4.37252e+01 1.78846e+00 520 2017 12 4.00263e+01 3.00248e-01 735 2018 1 4.29125e+01 1.36303e+00 632 2018 2 4.92023e+01 1.69371e+00 380 2018 3 5.42061e+01 1.94636e+00 576 2018 4 5.89379e+01 8.08017e-01 320 2018 5 6.01154e+01 1.24445e-01 418 2018 6 5.95298e+01 6.32445e-01 281 2018 7 5.92263e+01 2.01255e-01 88 2018 8 5.87444e+01 1.95371e-01 294 2018 9 5.57903e+01 1.17383e+00 448 2018 10 4.79080e+01 1.41071e+00 539 2018 11 4.29738e+01 1.45343e+00 708 2018 12 4.01757e+01 2.56036e-01 783 2019 1 4.21835e+01 8.00319e-01 665 2019 2 4.74643e+01 1.81822e+00 697 2019 3 5.46810e+01 1.52597e+00 530 2019 4 5.92498e+01 5.58221e-01 532 2019 5 6.01226e+01 6.02893e-02 28 2019 6 5.89576e+01 1.19502e-01 75 2019 7 5.91450e+01 1.08497e-01 199 2019 8 5.87368e+01 6.00535e-01 512 2019 9 5.53724e+01 1.29526e+00 181 2019 10 4.98839e+01 2.03250e+00 647 2019 11 4.36062e+01 1.45633e+00 805 2019 12 4.03088e+01 3.96591e-01 587 2020 1 4.29355e+01 1.35498e+00 514 2020 2 4.80708e+01 2.22925e+00 465 2020 3 5.43263e+01 2.17076e+00 433 2020 4 5.87939e+01 8.14650e-01 716 2020 5 6.01342e+01 1.81961e-01 229 2020 6 5.91486e+01 4.15793e-01 569 2020 7 5.90972e+01 1.77444e-01 285 2020 8 5.88612e+01 4.48543e-01 267 2020 9 5.48096e+01 1.53184e+00 279 2020 10 4.86229e+01 1.18039e+00 325 2020 11 4.37397e+01 1.77778e+00 497 2020 12 4.01887e+01 4.09393e-01 752 2021 1 4.21694e+01 1.25426e+00 815 2021 2 4.83992e+01 2.09334e+00 714 2021 3 5.47339e+01 1.53690e+00 663 2021 4 5.88482e+01 7.99359e-01 428 2021 5 6.00617e+01 1.44194e-01 192 2021 6 nan nan 0 2021 7 5.88954e+01 1.27001e-01 190 2021 8 5.87403e+01 6.37215e-01 146 2021 9 5.46641e+01 1.26374e+00 337 2021 10 4.93872e+01 1.82668e+00 464 2021 11 4.31942e+01 1.44688e+00 751 2021 12 4.02463e+01 4.40085e-01 865 2022 1 4.25370e+01 1.32574e+00 1078 2022 2 4.81053e+01 2.15244e+00 621 2022 3 5.41655e+01 1.51512e+00 244 2022 4 5.90906e+01 2.16654e-02 7 2022 5 6.00023e+01 1.83020e-01 306 2022 6 5.95405e+01 6.49945e-01 438 2022 7 5.91211e+01 1.52374e-01 188 2022 8 5.82825e+01 3.90800e-01 384 2022 9 5.45336e+01 1.11011e+00 228 2022 10 5.01740e+01 1.37227e+00 285 2022 11 4.32956e+01 1.50682e+00 882 2022 12 4.00882e+01 2.51784e-01 1146 2023 1 4.18879e+01 1.17963e+00 693 2023 2 4.79538e+01 2.00475e+00 522 2023 3 5.46299e+01 1.93453e+00 964 2023 4 5.90633e+01 7.69726e-01 642 2023 5 6.00993e+01 1.17687e-01 610 2023 6 5.93211e+01 5.71911e-01 200 2023 7 nan nan 0 2023 8 5.87418e+01 3.79644e-01 336 2023 9 5.53217e+01 1.00190e+00 384 2023 10 4.99982e+01 1.16584e+00 475 2023 11 4.27110e+01 1.24116e+00 401 2023 12 4.03303e+01 4.24396e-01 810 2024 1 4.22007e+01 1.26481e+00 572 2024 2 4.80408e+01 1.65015e+00 722 2024 3 5.46657e+01 1.45337e+00 512 2024 4 5.75550e+01 1.51046e-01 128