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 6.17670e+01 7.95092e-01 88 2002 8 5.76817e+01 7.28105e-01 63 2002 9 5.00595e+01 2.46517e+00 128 2002 10 4.38618e+01 2.45313e+00 162 2002 11 3.37030e+01 1.95554e+00 199 2002 12 2.97407e+01 4.66133e-01 177 2003 1 3.15304e+01 1.35439e+00 240 2003 2 3.95616e+01 2.33325e+00 160 2003 3 5.11184e+01 2.60177e+00 49 2003 4 5.73290e+01 1.98094e+00 189 2003 5 6.23527e+01 7.45438e-01 32 2003 6 6.29064e+01 1.78995e-01 64 2003 7 6.18655e+01 6.61379e-01 48 2003 8 5.70601e+01 8.60514e-01 48 2003 9 5.15589e+01 2.40220e+00 126 2003 10 4.18142e+01 2.69285e+00 208 2003 11 3.40022e+01 1.98097e+00 240 2003 12 2.97860e+01 4.65515e-01 200 2004 1 3.27308e+01 1.28066e+00 158 2004 2 4.22540e+01 1.56086e+00 64 2004 3 5.00485e+01 2.08669e+00 208 2004 4 5.73513e+01 2.11919e+00 143 2004 5 6.20462e+01 8.89956e-01 202 2004 6 6.30329e+01 1.01665e-01 87 2004 7 6.25823e+01 1.27857e-01 80 2004 8 5.70181e+01 1.51385e+00 112 2004 9 5.21864e+01 1.88443e+00 89 2004 10 4.24992e+01 2.87097e+00 130 2004 11 3.42943e+01 1.96445e+00 128 2004 12 2.95229e+01 1.49760e-01 160 2005 1 3.28472e+01 1.42445e+00 118 2005 2 3.90302e+01 1.58409e+00 128 2005 3 4.93545e+01 3.01271e+00 192 2005 4 5.70945e+01 1.49778e+00 112 2005 5 6.18856e+01 7.33197e-01 176 2005 6 6.29403e+01 3.78396e-01 101 2005 7 6.18745e+01 6.09417e-01 96 2005 8 5.89352e+01 3.40557e-01 45 2005 9 5.14284e+01 2.70377e+00 112 2005 10 4.18343e+01 2.62189e+00 256 2005 11 3.45128e+01 1.90702e+00 263 2005 12 2.99014e+01 5.77278e-01 163 2006 1 3.20358e+01 1.80053e+00 202 2006 2 3.97977e+01 2.36333e+00 192 2006 3 4.89194e+01 2.77720e+00 279 2006 4 5.72854e+01 2.02692e+00 208 2006 5 6.19880e+01 8.05480e-01 144 2006 6 6.30099e+01 1.49810e-01 128 2006 7 6.19517e+01 6.80986e-01 128 2006 8 5.84437e+01 1.38500e+00 160 2006 9 4.96879e+01 2.10835e+00 135 2006 10 4.28520e+01 3.02178e+00 241 2006 11 3.44311e+01 1.92144e+00 240 2006 12 2.97886e+01 5.00233e-01 112 2007 1 3.25083e+01 1.68902e+00 114 2007 2 4.00603e+01 2.09459e+00 192 2007 3 4.95062e+01 2.56439e+00 304 2007 4 5.79610e+01 1.82610e+00 217 2007 5 6.18254e+01 9.16450e-01 127 2007 6 6.29439e+01 1.65007e-01 112 2007 7 6.18261e+01 6.05340e-01 132 2007 8 5.71042e+01 1.50897e+00 128 2007 9 4.85005e+01 1.19302e+00 97 2007 10 4.38158e+01 1.49706e+00 127 2007 11 3.47153e+01 2.02246e+00 288 2007 12 2.99366e+01 4.68980e-01 179 2008 1 3.19186e+01 2.01878e+00 201 2008 2 4.00268e+01 3.02232e+00 256 2008 3 5.01817e+01 2.94552e+00 224 2008 4 5.81634e+01 1.61229e+00 176 2008 5 6.21387e+01 8.53952e-01 176 2008 6 6.30209e+01 1.85265e-01 176 2008 7 6.19230e+01 2.85167e-01 48 2008 8 5.67403e+01 1.67845e+00 38 2008 9 5.04890e+01 2.14538e+00 128 2008 10 4.19586e+01 2.76428e+00 287 2008 11 3.41221e+01 1.84895e+00 288 2008 12 2.98323e+01 5.73153e-01 250 2009 1 3.24701e+01 1.67976e+00 151 2009 2 3.98825e+01 2.61673e+00 208 2009 3 4.81414e+01 2.00280e+00 216 2009 4 5.76910e+01 1.94967e+00 158 2009 5 6.16764e+01 1.11493e+00 105 2009 6 6.30106e+01 1.32224e-01 96 2009 7 6.23306e+01 4.27493e-01 64 2009 8 5.78774e+01 1.67848e+00 96 2009 9 5.13238e+01 2.14873e+00 80 2009 10 4.25340e+01 2.68785e+00 215 2009 11 3.41099e+01 2.05440e+00 238 2009 12 2.95058e+01 1.04298e-01 64 2010 1 3.19538e+01 1.77530e+00 182 2010 2 4.05016e+01 2.41518e+00 229 2010 3 4.93644e+01 3.10028e+00 240 2010 4 5.74121e+01 1.78353e+00 206 2010 5 6.23025e+01 5.35257e-01 126 2010 6 6.29421e+01 1.11205e-01 176 2010 7 6.15697e+01 8.51003e-01 57 2010 8 5.79980e+01 1.06671e+00 96 2010 9 5.10192e+01 2.05160e+00 202 2010 10 4.27135e+01 2.62442e+00 343 2010 11 3.42123e+01 1.93331e+00 304 2010 12 2.99443e+01 5.64008e-01 224 2011 1 3.24310e+01 1.75039e+00 176 2011 2 4.08935e+01 1.67573e+00 160 2011 3 4.91029e+01 2.41439e+00 222 2011 4 5.67657e+01 1.74735e+00 176 2011 5 6.18162e+01 8.12752e-01 240 2011 6 6.31094e+01 1.56778e-01 144 2011 7 6.15746e+01 8.15790e-01 88 2011 8 5.75840e+01 1.56739e+00 149 2011 9 5.05033e+01 2.33255e+00 159 2011 10 4.22820e+01 2.87750e+00 301 2011 11 3.43664e+01 2.08572e+00 267 2011 12 2.99470e+01 5.96562e-01 252 2012 1 3.20203e+01 1.97611e+00 240 2012 2 3.95782e+01 1.47975e+00 64 2012 3 4.98230e+01 2.38277e+00 192 2012 4 5.74766e+01 1.90113e+00 224 2012 5 6.20084e+01 7.53081e-01 144 2012 6 6.31130e+01 1.65165e-01 112 2012 7 6.22662e+01 5.14010e-01 127 2012 8 5.74651e+01 1.38014e+00 96 2012 9 5.21521e+01 2.76858e+00 63 2012 10 4.19016e+01 2.39106e+00 229 2012 11 3.43170e+01 2.19270e+00 272 2012 12 2.98883e+01 5.32336e-01 160 2013 1 3.37945e+01 1.23393e+00 144 2013 2 4.03890e+01 2.74594e+00 144 2013 3 4.94347e+01 2.95822e+00 214 2013 4 5.73107e+01 1.75587e+00 111 2013 5 6.21448e+01 7.22251e-01 120 2013 6 6.30081e+01 5.61304e-02 69 2013 7 6.22228e+01 3.02445e-01 20 2013 8 5.80956e+01 1.91293e+00 48 2013 9 5.22718e+01 1.86114e+00 150 2013 10 4.13128e+01 2.29004e+00 181 2013 11 3.43055e+01 2.15789e+00 112 2013 12 2.96075e+01 3.93010e-01 208 2014 1 3.22088e+01 1.18408e+00 127 2014 2 4.10146e+01 1.95508e+00 160 2014 3 5.01306e+01 2.87769e+00 190 2014 4 5.73474e+01 2.09257e+00 128 2014 5 6.17017e+01 7.05057e-01 128 2014 6 6.29757e+01 1.17151e-01 149 2014 7 6.19209e+01 7.74941e-01 94 2014 8 5.78913e+01 1.43234e+00 208 2014 9 5.19381e+01 2.18833e+00 127 2014 10 4.21815e+01 2.43518e+00 279 2014 11 3.42450e+01 2.22579e+00 231 2014 12 2.98792e+01 3.81895e-01 224 2015 1 3.27704e+01 1.78705e+00 208 2015 2 3.93779e+01 1.88937e+00 209 2015 3 4.90698e+01 3.03606e+00 112 2015 4 5.45194e+01 4.93453e-01 64 2015 5 6.18048e+01 8.62310e-01 190 2015 6 6.29577e+01 1.49923e-01 140 2015 7 6.21795e+01 6.01251e-01 83 2015 8 5.73470e+01 1.12258e+00 115 2015 9 5.09401e+01 1.76056e+00 111 2015 10 4.17759e+01 2.21049e+00 224 2015 11 3.37043e+01 2.09005e+00 226 2015 12 2.98934e+01 3.46738e-01 94 2016 1 3.26926e+01 1.47073e+00 156 2016 2 4.02775e+01 2.56239e+00 272 2016 3 4.82787e+01 2.21311e+00 176 2016 4 5.68834e+01 1.92776e+00 128 2016 5 6.16215e+01 7.98833e-01 144 2016 6 6.29846e+01 1.43873e-01 175 2016 7 6.20406e+01 6.77014e-01 168 2016 8 5.69688e+01 1.35579e+00 144 2016 9 4.98624e+01 2.15996e+00 224 2016 10 4.18785e+01 2.83385e+00 273 2016 11 3.44459e+01 1.79069e+00 160 2016 12 2.96883e+01 4.77202e-01 224 2017 1 3.20132e+01 1.73121e+00 169 2017 2 4.00703e+01 2.67170e+00 272 2017 3 4.97188e+01 2.39575e+00 212 2017 4 5.68329e+01 1.53745e+00 144 2017 5 6.18829e+01 8.74973e-01 129 2017 6 6.28554e+01 1.64228e-01 74 2017 7 6.17936e+01 7.91930e-01 96 2017 8 5.80397e+01 1.22899e+00 112 2017 9 5.01728e+01 2.20220e+00 182 2017 10 4.14708e+01 2.72258e+00 209 2017 11 3.39773e+01 2.02459e+00 288 2017 12 2.98501e+01 3.60723e-01 119 2018 1 3.20623e+01 1.76921e+00 224 2018 2 4.02534e+01 2.68900e+00 104 2018 3 4.86482e+01 2.82753e+00 224 2018 4 5.70353e+01 1.99566e+00 144 2018 5 6.16593e+01 7.53644e-01 153 2018 6 6.29544e+01 9.03072e-02 142 2018 7 6.18237e+01 6.11567e-01 112 2018 8 5.67797e+01 1.46264e+00 45 2018 9 5.10585e+01 2.00565e+00 200 2018 10 4.18589e+01 2.66285e+00 251 2018 11 3.37202e+01 1.91707e+00 112 2018 12 2.98060e+01 5.02581e-01 126 2019 1 3.21841e+01 1.68575e+00 224 2019 2 3.78766e+01 6.49945e-01 48 2019 3 4.98530e+01 2.53983e+00 249 2019 4 5.79128e+01 1.71307e+00 126 2019 5 6.18583e+01 8.73371e-01 208 2019 6 6.30876e+01 1.65069e-01 64 2019 7 6.16895e+01 8.32746e-01 112 2019 8 5.75820e+01 1.63417e+00 176 2019 9 5.10965e+01 2.36003e+00 263 2019 10 4.30858e+01 3.01374e+00 208 2019 11 3.39507e+01 2.09606e+00 160 2019 12 2.98255e+01 5.31172e-01 128 2020 1 3.15320e+01 1.60763e+00 192 2020 2 4.04392e+01 3.33006e+00 147 2020 3 4.97208e+01 1.97881e+00 112 2020 4 5.78134e+01 2.13150e+00 118 2020 5 6.15562e+01 7.56430e-01 144 2020 6 6.31266e+01 1.27561e-01 107 2020 7 6.15648e+01 3.08774e-01 22 2020 8 5.96536e+01 3.88990e-01 51 2020 9 5.01989e+01 2.24406e+00 96 2020 10 4.19894e+01 2.66608e+00 191 2020 11 3.41982e+01 1.91486e+00 288 2020 12 2.97197e+01 3.85709e-01 224 2021 1 3.20709e+01 2.02392e+00 112 2021 2 4.16311e+01 2.50504e+00 103 2021 3 4.84862e+01 1.85152e+00 140 2021 4 5.69537e+01 2.12595e+00 170 2021 5 6.23088e+01 5.70043e-01 173 2021 6 6.30522e+01 8.41977e-02 63 2021 7 6.15867e+01 4.66321e-01 59 2021 8 5.82293e+01 1.40451e+00 128 2021 9 5.20305e+01 2.73761e+00 96 2021 10 4.17386e+01 2.24110e+00 96 2021 11 3.39245e+01 1.84073e+00 224 2021 12 2.96202e+01 4.59389e-01 159 2022 1 3.25711e+01 2.05910e+00 208 2022 2 4.02613e+01 2.67643e+00 176 2022 3 4.93223e+01 3.10925e+00 254 2022 4 5.91177e+01 4.27692e-01 80 2022 5 6.19796e+01 8.11526e-01 111 2022 6 6.30015e+01 1.67935e-01 128 2022 7 6.17959e+01 8.09747e-01 72 2022 8 5.77599e+01 1.82044e+00 67 2022 9 5.05499e+01 2.16930e+00 144 2022 10 4.25463e+01 2.66425e+00 336 2022 11 3.45827e+01 1.97942e+00 165 2022 12 2.96668e+01 3.44015e-01 192 2023 1 3.20457e+01 1.61078e+00 237 2023 2 3.98881e+01 2.40315e+00 180 2023 3 4.87522e+01 1.81608e+00 112 2023 4 5.82106e+01 1.44225e+00 112 2023 5 6.16431e+01 7.14096e-01 139 2023 6 6.29893e+01 1.41131e-01 100 2023 7 6.22367e+01 9.01954e-01 64 2023 8 5.71694e+01 1.31585e+00 160 2023 9 5.11180e+01 1.35122e+00 160 2023 10 4.11040e+01 2.29888e+00 220 2023 11 3.53897e+01 1.68613e+00 176 2023 12 2.95191e+01 3.45403e-01 96 2024 1 3.19569e+01 1.90404e+00 128 2024 2 4.10818e+01 1.98365e+00 144 2024 3 5.03187e+01 2.88443e+00 113 2024 4 nan nan 0