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 6.21166e+01 4.83150e-01 17 2002 8 5.61307e+01 1.24820e-01 46 2002 9 5.04042e+01 2.52272e+00 80 2002 10 4.21718e+01 1.89215e+00 106 2002 11 3.30529e+01 2.01326e+00 141 2002 12 2.96066e+01 4.33669e-01 155 2003 1 3.15259e+01 1.51396e+00 186 2003 2 3.82095e+01 1.95428e+00 109 2003 3 5.00995e+01 2.09222e+00 44 2003 4 5.64575e+01 1.86427e+00 126 2003 5 6.16803e+01 9.70188e-01 43 2003 6 6.09660e+01 1.53477e-01 50 2003 7 6.14117e+01 6.51906e-01 48 2003 8 5.55066e+01 1.89330e-01 48 2003 9 5.11193e+01 2.31970e+00 109 2003 10 4.14477e+01 2.73270e+00 191 2003 11 3.37428e+01 1.93669e+00 224 2003 12 2.95322e+01 4.18968e-01 158 2004 1 3.24195e+01 1.13439e+00 145 2004 2 4.18931e+01 1.57938e+00 63 2004 3 5.02675e+01 1.81831e+00 176 2004 4 5.61963e+01 1.92997e+00 122 2004 5 6.13497e+01 8.62271e-01 146 2004 6 6.04553e+01 4.76301e-02 15 2004 7 6.20804e+01 1.61558e-01 64 2004 8 5.59305e+01 8.55181e-01 65 2004 9 5.04432e+01 1.50176e+00 46 2004 10 4.11878e+01 2.29814e+00 70 2004 11 3.43622e+01 2.07336e+00 159 2004 12 2.94905e+01 3.52711e-01 123 2005 1 3.20279e+01 1.70226e+00 198 2005 2 3.90181e+01 1.82334e+00 144 2005 3 4.84989e+01 2.84138e+00 175 2005 4 5.87226e+01 3.72201e-03 16 2005 5 6.16552e+01 8.83402e-01 111 2005 6 6.09876e+01 2.28046e-01 60 2005 7 6.10944e+01 6.61924e-01 96 2005 8 5.71304e+01 2.07685e+00 38 2005 9 5.17032e+01 2.70744e+00 67 2005 10 4.16585e+01 2.70398e+00 240 2005 11 3.41259e+01 1.85412e+00 222 2005 12 2.96426e+01 4.46075e-01 124 2006 1 3.05996e+01 1.47759e+00 102 2006 2 4.02433e+01 2.61521e+00 162 2006 3 4.82695e+01 2.88313e+00 240 2006 4 5.66445e+01 2.04910e+00 151 2006 5 6.17278e+01 8.79132e-01 128 2006 6 6.08562e+01 2.47461e-01 64 2006 7 6.08918e+01 5.90214e-01 48 2006 8 5.73281e+01 1.80439e+00 128 2006 9 4.91366e+01 1.97333e+00 112 2006 10 4.31068e+01 3.17649e+00 180 2006 11 3.36665e+01 1.69319e+00 137 2006 12 2.96966e+01 5.50140e-01 98 2007 1 3.17180e+01 1.25131e+00 65 2007 2 3.95978e+01 2.14830e+00 186 2007 3 4.87323e+01 2.51124e+00 254 2007 4 5.71188e+01 2.03387e+00 147 2007 5 5.98930e+01 4.00768e-01 23 2007 6 6.05511e+01 3.47986e-01 48 2007 7 6.08293e+01 7.67792e-01 112 2007 8 5.60331e+01 1.23831e+00 80 2007 9 4.90345e+01 1.10448e+00 60 2007 10 4.27619e+01 1.83552e+00 128 2007 11 3.43647e+01 1.80897e+00 247 2007 12 2.95396e+01 1.59543e-01 64 2008 1 3.18685e+01 2.13902e+00 110 2008 2 3.87965e+01 2.76097e+00 218 2008 3 5.05363e+01 2.65870e+00 172 2008 4 5.77316e+01 9.81539e-01 112 2008 5 6.24301e+01 3.69511e-01 96 2008 6 6.10874e+01 6.75490e-01 128 2008 7 6.11579e+01 8.04879e-01 53 2008 8 5.88708e+01 2.90480e-03 16 2008 9 5.06495e+01 1.64786e+00 132 2008 10 4.16459e+01 2.93304e+00 256 2008 11 3.40101e+01 1.78804e+00 250 2008 12 2.97854e+01 4.85395e-01 135 2009 1 3.16948e+01 1.83092e+00 148 2009 2 4.00003e+01 2.51797e+00 176 2009 3 4.74205e+01 1.44103e+00 125 2009 4 5.90485e+01 2.82187e-01 48 2009 5 6.17586e+01 1.15881e+00 80 2009 6 6.08422e+01 6.81469e-03 16 2009 7 6.06351e+01 9.52163e-01 37 2009 8 5.67544e+01 1.16899e+00 40 2009 9 5.16035e+01 2.05654e+00 64 2009 10 4.15962e+01 3.06697e+00 181 2009 11 3.38382e+01 1.81661e+00 160 2009 12 2.97934e+01 3.89581e-01 32 2010 1 3.29468e+01 1.41686e+00 26 2010 2 4.00231e+01 2.61794e+00 64 2010 3 4.91216e+01 3.31981e+00 153 2010 4 5.66351e+01 1.96749e+00 144 2010 5 6.16451e+01 5.72145e-01 48 2010 6 6.10875e+01 6.83672e-01 96 2010 7 6.11216e+01 7.69406e-01 64 2010 8 5.86624e+01 1.27642e-01 32 2010 9 5.09528e+01 2.24814e+00 144 2010 10 4.24730e+01 2.67288e+00 304 2010 11 3.35015e+01 1.73309e+00 272 2010 12 2.97812e+01 4.20881e-01 160 2011 1 3.18250e+01 1.69222e+00 168 2011 2 4.13868e+01 1.23548e+00 112 2011 3 4.93546e+01 2.32284e+00 128 2011 4 5.56117e+01 1.65678e+00 144 2011 5 6.17664e+01 6.40949e-01 80 2011 6 6.12294e+01 6.60086e-01 112 2011 7 6.12378e+01 5.13314e-01 80 2011 8 5.58524e+01 1.25126e+00 67 2011 9 5.14994e+01 2.38441e+00 160 2011 10 4.19081e+01 2.73567e+00 239 2011 11 3.37230e+01 1.61079e+00 102 2011 12 2.95119e+01 4.47181e-01 177 2012 1 3.17702e+01 1.74930e+00 159 2012 2 4.01477e+01 1.23259e+00 30 2012 3 5.01082e+01 1.85245e+00 144 2012 4 5.67205e+01 1.82000e+00 208 2012 5 6.13616e+01 7.73328e-01 144 2012 6 6.08874e+01 1.08138e-01 64 2012 7 6.17173e+01 5.76163e-01 80 2012 8 5.61840e+01 1.17362e+00 80 2012 9 4.98679e+01 2.52323e+00 80 2012 10 4.14319e+01 1.84546e+00 189 2012 11 3.41098e+01 2.11631e+00 224 2012 12 2.99197e+01 3.87038e-01 76 2013 1 3.32598e+01 8.27742e-01 110 2013 2 3.88207e+01 2.53644e+00 144 2013 3 5.19303e+01 1.58873e+00 84 2013 4 5.50432e+01 7.43072e-01 78 2013 5 6.18109e+01 7.24227e-01 80 2013 6 6.11031e+01 7.64039e-02 32 2013 7 nan nan 0 2013 8 5.70493e+01 1.73646e+00 74 2013 9 5.12662e+01 2.17788e+00 144 2013 10 4.11192e+01 2.72561e+00 176 2013 11 3.35607e+01 2.40689e+00 83 2013 12 2.94314e+01 3.46704e-01 130 2014 1 3.22507e+01 1.11015e+00 64 2014 2 4.03267e+01 1.96706e+00 144 2014 3 5.05434e+01 2.39194e+00 109 2014 4 5.47015e+01 7.12572e-01 48 2014 5 6.13522e+01 8.25660e-01 118 2014 6 6.08986e+01 1.50893e-01 96 2014 7 6.16398e+01 9.92988e-01 48 2014 8 5.65164e+01 1.80346e+00 84 2014 9 5.10399e+01 1.97101e+00 160 2014 10 4.17118e+01 2.70452e+00 310 2014 11 3.31142e+01 2.07065e+00 152 2014 12 2.95582e+01 3.31050e-01 172 2015 1 3.22959e+01 1.90418e+00 146 2015 2 3.84877e+01 1.54198e+00 141 2015 3 4.92059e+01 2.97375e+00 144 2015 4 5.39917e+01 4.38151e-01 48 2015 5 6.12951e+01 9.32084e-01 144 2015 6 6.09225e+01 2.40182e-01 43 2015 7 6.13764e+01 5.97980e-01 64 2015 8 5.61967e+01 1.11594e+00 98 2015 9 5.00112e+01 1.75804e+00 86 2015 10 4.17609e+01 2.42124e+00 131 2015 11 3.27883e+01 1.77948e+00 188 2015 12 2.98818e+01 3.59723e-01 114 2016 1 3.22643e+01 1.47743e+00 36 2016 2 4.05399e+01 2.51876e+00 143 2016 3 4.84885e+01 1.99833e+00 109 2016 4 5.57275e+01 1.92743e+00 80 2016 5 6.15681e+01 6.54811e-01 112 2016 6 6.13501e+01 9.02504e-01 112 2016 7 6.12330e+01 6.61035e-01 160 2016 8 5.60837e+01 9.34161e-01 123 2016 9 5.06419e+01 2.31209e+00 160 2016 10 4.13496e+01 2.92761e+00 256 2016 11 3.35237e+01 1.66696e+00 176 2016 12 2.94258e+01 4.12851e-01 142 2017 1 3.27247e+01 1.49951e+00 46 2017 2 3.99449e+01 2.33540e+00 208 2017 3 4.97717e+01 2.63242e+00 177 2017 4 5.62750e+01 1.53491e+00 112 2017 5 6.13047e+01 8.13149e-01 96 2017 6 6.07006e+01 1.66507e-01 48 2017 7 6.11916e+01 7.55149e-01 64 2017 8 5.78438e+01 6.79076e-01 36 2017 9 4.97602e+01 2.10485e+00 128 2017 10 4.01215e+01 2.23260e+00 175 2017 11 3.36520e+01 2.07078e+00 252 2017 12 2.97379e+01 3.60984e-01 107 2018 1 3.18286e+01 1.86501e+00 176 2018 2 4.10715e+01 2.05864e+00 96 2018 3 4.77536e+01 2.68589e+00 192 2018 4 5.66016e+01 1.87966e+00 144 2018 5 6.12966e+01 9.12280e-01 82 2018 6 6.06998e+01 1.02809e-01 62 2018 7 6.11075e+01 4.53183e-01 66 2018 8 5.73522e+01 1.34207e+00 62 2018 9 5.05580e+01 1.50706e+00 128 2018 10 4.22660e+01 3.14794e+00 242 2018 11 3.35265e+01 1.66721e+00 111 2018 12 3.00633e+01 2.27447e-01 36 2019 1 3.18176e+01 1.87686e+00 55 2019 2 3.96873e+01 2.28777e+00 62 2019 3 4.95198e+01 2.75863e+00 209 2019 4 5.68530e+01 1.36320e+00 112 2019 5 6.18477e+01 6.73782e-01 129 2019 6 6.14813e+01 1.00963e+00 88 2019 7 6.04715e+01 1.81104e-01 64 2019 8 5.65046e+01 1.54699e+00 134 2019 9 5.11836e+01 2.40162e+00 240 2019 10 4.31735e+01 2.55114e+00 128 2019 11 3.35882e+01 1.97321e+00 176 2019 12 2.99956e+01 4.23164e-01 64 2020 1 3.12348e+01 1.91935e+00 104 2020 2 3.93281e+01 3.64772e+00 80 2020 3 5.14148e+01 2.18427e+00 77 2020 4 5.67415e+01 1.96788e+00 96 2020 5 6.14161e+01 6.10250e-01 96 2020 6 6.09153e+01 1.65453e-01 80 2020 7 6.09500e+01 6.28522e-01 46 2020 8 5.87446e+01 2.62471e-01 48 2020 9 5.09534e+01 2.56331e+00 64 2020 10 4.14273e+01 2.53720e+00 160 2020 11 3.37860e+01 1.76129e+00 179 2020 12 2.95222e+01 3.40269e-01 243 2021 1 3.12214e+01 1.76631e+00 87 2021 2 3.94414e+01 2.20520e+00 48 2021 3 4.79310e+01 1.94295e+00 111 2021 4 5.65163e+01 2.00138e+00 145 2021 5 6.21599e+01 4.14834e-01 92 2021 6 6.19969e+01 9.18881e-01 32 2021 7 6.08779e+01 3.02526e-01 80 2021 8 5.73893e+01 1.28866e+00 144 2021 9 4.99270e+01 2.23371e+00 96 2021 10 4.14460e+01 1.84937e+00 112 2021 11 3.33522e+01 1.70607e+00 207 2021 12 2.93853e+01 3.84128e-01 144 2022 1 3.15812e+01 1.89483e+00 159 2022 2 4.13093e+01 2.61219e+00 116 2022 3 4.91372e+01 3.28263e+00 194 2022 4 5.85097e+01 4.34785e-01 35 2022 5 6.00210e+01 5.08941e-01 52 2022 6 6.11893e+01 7.77231e-01 168 2022 7 6.12651e+01 6.81937e-01 108 2022 8 5.72696e+01 1.94350e+00 68 2022 9 5.08971e+01 1.58527e+00 115 2022 10 4.25329e+01 2.55941e+00 301 2022 11 3.49402e+01 1.80914e+00 99 2022 12 2.96309e+01 3.02469e-01 144 2023 1 3.12509e+01 1.43508e+00 167 2023 2 3.93862e+01 3.03684e+00 110 2023 3 4.81823e+01 1.64807e+00 94 2023 4 5.70389e+01 1.52155e+00 80 2023 5 6.12203e+01 8.18062e-01 65 2023 6 6.10325e+01 1.08261e+00 79 2023 7 6.07638e+01 5.14031e-01 54 2023 8 5.64778e+01 1.72318e+00 64 2023 9 5.14015e+01 1.58695e+00 165 2023 10 4.01171e+01 2.22791e+00 197 2023 11 3.43798e+01 1.82025e+00 115 2023 12 2.93913e+01 3.60579e-01 74 2024 1 3.10810e+01 1.94395e+00 69 2024 2 3.99927e+01 2.39490e+00 80 2024 3 4.91747e+01 2.82152e+00 75 2024 4 nan nan 0