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 6.29835e+01 2.51609e-01 84 2002 8 5.88745e+01 7.17090e-01 48 2002 9 5.36866e+01 2.00952e+00 101 2002 10 4.58880e+01 2.43865e+00 236 2002 11 3.85337e+01 1.65109e+00 155 2002 12 3.39583e+01 3.44808e-01 144 2003 1 3.56120e+01 1.12639e+00 160 2003 2 4.18973e+01 1.78217e+00 132 2003 3 5.13645e+01 2.42180e+00 55 2003 4 5.77721e+01 8.46456e-01 87 2003 5 6.19354e+01 3.46333e-01 64 2003 6 6.34172e+01 1.79372e-01 32 2003 7 6.20415e+01 2.74159e-01 32 2003 8 5.97441e+01 1.82211e-01 42 2003 9 5.32288e+01 1.27164e+00 60 2003 10 4.54276e+01 2.34985e+00 188 2003 11 3.68090e+01 1.08769e+00 130 2003 12 3.40198e+01 4.39218e-01 128 2004 1 3.61718e+01 1.79123e+00 129 2004 2 4.28495e+01 2.33745e+00 132 2004 3 5.20924e+01 1.95503e+00 60 2004 4 5.84626e+01 6.13784e-02 16 2004 5 6.28956e+01 2.96918e-01 64 2004 6 6.26612e+01 3.63633e-01 119 2004 7 6.22944e+01 4.82669e-01 105 2004 8 5.93152e+01 8.86552e-01 58 2004 9 5.18770e+01 1.90320e+00 80 2004 10 4.45571e+01 1.47211e+00 112 2004 11 3.86909e+01 1.24740e+00 115 2004 12 3.38122e+01 7.01933e-01 151 2005 1 3.64564e+01 1.20353e+00 162 2005 2 4.23009e+01 1.48880e+00 156 2005 3 5.03762e+01 2.47026e+00 110 2005 4 5.78954e+01 1.37950e+00 77 2005 5 6.21801e+01 5.57027e-01 48 2005 6 6.38741e+01 1.06458e-01 16 2005 7 6.27733e+01 8.42134e-01 81 2005 8 5.98522e+01 6.34490e-01 36 2005 9 5.35557e+01 1.54566e+00 128 2005 10 4.68038e+01 1.53963e+00 77 2005 11 3.83194e+01 2.30455e+00 161 2005 12 3.41749e+01 4.45882e-01 163 2006 1 3.57265e+01 1.65362e+00 199 2006 2 4.31877e+01 1.58837e+00 184 2006 3 5.09569e+01 2.78792e+00 128 2006 4 5.69541e+01 1.37567e+00 86 2006 5 6.16011e+01 7.76304e-01 91 2006 6 6.34102e+01 2.15500e-01 48 2006 7 6.25363e+01 7.11637e-01 48 2006 8 5.88998e+01 1.18321e+00 96 2006 9 5.34292e+01 1.79714e+00 63 2006 10 4.54658e+01 2.10555e+00 202 2006 11 3.68309e+01 1.23566e+00 96 2006 12 3.38984e+01 3.41293e-01 65 2007 1 3.66918e+01 1.57188e+00 125 2007 2 4.49020e+01 9.56467e-01 73 2007 3 5.05548e+01 2.05613e+00 96 2007 4 5.71749e+01 1.41634e+00 108 2007 5 6.19295e+01 1.62497e-01 48 2007 6 6.30377e+01 3.02569e-01 65 2007 7 6.28252e+01 4.64260e-01 96 2007 8 5.99452e+01 9.72029e-01 86 2007 9 5.29416e+01 1.90731e+00 80 2007 10 4.68964e+01 2.25177e+00 89 2007 11 3.81903e+01 1.69956e+00 220 2007 12 3.36645e+01 1.33170e+00 193 2008 1 3.57432e+01 2.36034e+00 116 2008 2 4.27014e+01 2.61238e+00 120 2008 3 5.02087e+01 1.78630e+00 51 2008 4 5.88750e+01 1.69067e+00 79 2008 5 6.03500e+01 0.00000e+00 1 2008 6 6.28836e+01 3.60873e-01 48 2008 7 6.19102e+01 1.89914e-01 32 2008 8 6.02418e+01 1.20883e+00 66 2008 9 5.29451e+01 1.20916e+00 72 2008 10 4.67598e+01 2.42248e+00 116 2008 11 3.74691e+01 1.91319e+00 217 2008 12 3.39544e+01 3.29031e-01 144 2009 1 3.66059e+01 1.81761e+00 208 2009 2 4.31409e+01 2.06529e+00 118 2009 3 4.96220e+01 1.42516e+00 105 2009 4 5.81412e+01 1.56914e+00 32 2009 5 6.13159e+01 7.61770e-01 87 2009 6 nan nan 0 2009 7 6.27954e+01 7.13646e-02 16 2009 8 6.02746e+01 1.03645e+00 80 2009 9 5.38966e+01 1.41793e+00 32 2009 10 4.65121e+01 2.74106e+00 218 2009 11 3.75563e+01 2.08039e+00 160 2009 12 3.39532e+01 1.05664e-01 46 2010 1 3.66137e+01 1.79800e+00 143 2010 2 4.46657e+01 1.88116e+00 107 2010 3 5.14482e+01 2.35737e+00 137 2010 4 5.60379e+01 4.67513e-01 34 2010 5 6.21555e+01 7.70657e-01 74 2010 6 6.28049e+01 4.66877e-01 127 2010 7 6.18763e+01 9.96848e-02 53 2010 8 6.01660e+01 1.06416e+00 64 2010 9 5.56403e+01 4.40809e-03 16 2010 10 4.64896e+01 2.49039e+00 221 2010 11 3.79831e+01 1.58700e+00 172 2010 12 3.39624e+01 5.59613e-01 240 2011 1 3.58016e+01 2.06155e+00 135 2011 2 4.29565e+01 2.03118e+00 184 2011 3 5.11184e+01 2.37403e+00 200 2011 4 5.79942e+01 1.37554e+00 134 2011 5 6.17716e+01 6.12339e-01 104 2011 6 6.27253e+01 5.06536e-01 84 2011 7 6.21426e+01 3.01962e-01 112 2011 8 6.13780e+01 1.14521e-01 16 2011 9 5.22683e+01 1.46307e+00 108 2011 10 4.78878e+01 1.86560e+00 70 2011 11 3.80431e+01 2.20460e+00 157 2011 12 3.41057e+01 5.56811e-01 175 2012 1 3.54005e+01 1.37079e+00 166 2012 2 4.41233e+01 1.87306e+00 169 2012 3 5.19111e+01 2.79229e+00 85 2012 4 5.69960e+01 1.89044e+00 96 2012 5 6.14634e+01 1.06592e+00 88 2012 6 6.32676e+01 1.47097e-01 48 2012 7 6.22099e+01 8.61332e-01 96 2012 8 5.93188e+01 1.19084e+00 91 2012 9 5.31523e+01 2.47449e+00 80 2012 10 4.53196e+01 2.25623e+00 145 2012 11 3.85145e+01 1.82661e+00 218 2012 12 3.40580e+01 5.56933e-01 120 2013 1 3.60993e+01 1.70943e+00 101 2013 2 4.26584e+01 2.27374e+00 146 2013 3 5.06296e+01 1.98190e+00 108 2013 4 5.82003e+01 1.46656e+00 64 2013 5 6.19237e+01 3.68264e-01 80 2013 6 6.33194e+01 7.27887e-01 48 2013 7 6.24829e+01 6.05349e-01 96 2013 8 5.89694e+01 1.04744e-01 16 2013 9 5.52664e+01 1.20886e+00 29 2013 10 4.56402e+01 2.24485e+00 218 2013 11 3.81522e+01 1.94105e+00 92 2013 12 3.40408e+01 4.38695e-01 100 2014 1 3.72682e+01 1.07535e+00 144 2014 2 4.26139e+01 1.81077e+00 142 2014 3 5.02625e+01 1.88740e+00 190 2014 4 5.87789e+01 1.59094e+00 85 2014 5 6.17765e+01 5.04980e-01 96 2014 6 6.29759e+01 5.10015e-01 109 2014 7 6.19464e+01 3.49310e-01 74 2014 8 6.01960e+01 1.25919e+00 112 2014 9 5.37176e+01 2.63773e+00 68 2014 10 4.50306e+01 2.32357e+00 134 2014 11 3.82249e+01 2.05117e+00 168 2014 12 3.38263e+01 2.99339e-01 187 2015 1 3.66833e+01 1.70917e+00 143 2015 2 4.36851e+01 1.42905e+00 161 2015 3 5.11496e+01 2.53766e+00 154 2015 4 5.68040e+01 8.49411e-01 60 2015 5 6.15037e+01 6.20536e-01 80 2015 6 6.29894e+01 4.32602e-01 83 2015 7 6.20923e+01 5.57010e-01 64 2015 8 5.99325e+01 8.80485e-01 64 2015 9 5.52080e+01 2.08627e+00 61 2015 10 4.61129e+01 2.02932e+00 32 2015 11 3.82071e+01 1.96218e+00 133 2015 12 3.36946e+01 1.32167e-01 71 2016 1 3.63110e+01 1.63784e+00 48 2016 2 4.42652e+01 2.74543e+00 180 2016 3 5.13231e+01 2.31453e+00 104 2016 4 5.75956e+01 1.46329e+00 92 2016 5 6.20217e+01 4.81126e-01 96 2016 6 6.31020e+01 1.46816e-01 80 2016 7 6.22982e+01 7.70802e-01 102 2016 8 5.95771e+01 9.23318e-01 87 2016 9 5.34116e+01 1.57567e+00 97 2016 10 4.62476e+01 1.66404e+00 138 2016 11 3.75187e+01 1.75168e+00 174 2016 12 3.37754e+01 4.18937e-01 142 2017 1 3.64980e+01 1.58221e+00 153 2017 2 4.27225e+01 2.05458e+00 171 2017 3 5.18265e+01 2.05822e+00 183 2017 4 5.89576e+01 1.20788e+00 47 2017 5 6.16557e+01 7.74416e-01 116 2017 6 6.31214e+01 4.08840e-01 53 2017 7 6.27044e+01 6.38716e-01 112 2017 8 5.97849e+01 9.85817e-01 121 2017 9 5.38457e+01 5.18110e-01 50 2017 10 4.38432e+01 1.34352e+00 76 2017 11 3.76785e+01 2.03968e+00 199 2017 12 3.39914e+01 3.83516e-01 346 2018 1 3.54782e+01 1.06263e+00 116 2018 2 4.40171e+01 2.13644e+00 170 2018 3 5.14810e+01 2.23051e+00 152 2018 4 5.78074e+01 1.14304e+00 58 2018 5 6.12521e+01 3.45645e-01 45 2018 6 6.28585e+01 3.83002e-01 64 2018 7 6.28025e+01 3.41857e-01 80 2018 8 6.00259e+01 1.19837e+00 102 2018 9 5.45275e+01 1.22439e+00 94 2018 10 4.49735e+01 2.07952e+00 155 2018 11 3.78536e+01 1.78841e+00 99 2018 12 3.39777e+01 4.33882e-01 149 2019 1 3.60598e+01 1.15164e+00 160 2019 2 4.30311e+01 2.79488e+00 155 2019 3 5.19952e+01 2.61450e+00 130 2019 4 5.85694e+01 1.69102e+00 108 2019 5 6.18759e+01 9.66647e-01 81 2019 6 6.31638e+01 4.14861e-01 80 2019 7 6.21878e+01 4.73665e-01 103 2019 8 5.99289e+01 6.83481e-01 48 2019 9 5.33147e+01 1.23334e+00 96 2019 10 4.51972e+01 2.60230e+00 150 2019 11 3.76782e+01 1.91327e+00 188 2019 12 3.43779e+01 5.43098e-01 56 2020 1 3.61819e+01 1.62129e+00 209 2020 2 4.30690e+01 2.80542e+00 101 2020 3 5.18230e+01 1.93404e+00 115 2020 4 5.77128e+01 2.04546e+00 99 2020 5 6.20297e+01 5.64126e-01 112 2020 6 6.29694e+01 4.37109e-01 32 2020 7 6.22946e+01 8.02159e-01 66 2020 8 5.92874e+01 1.30468e+00 160 2020 9 5.27300e+01 3.05144e+00 44 2020 10 4.45718e+01 2.24178e+00 148 2020 11 3.56264e+01 8.18157e-01 35 2020 12 3.38241e+01 4.22154e-01 198 2021 1 3.63122e+01 1.54437e+00 172 2021 2 4.23370e+01 2.05748e+00 113 2021 3 5.13084e+01 2.67604e+00 208 2021 4 5.77401e+01 1.36465e+00 96 2021 5 6.12149e+01 5.32060e-01 41 2021 6 6.21466e+01 9.23820e-01 28 2021 7 6.19781e+01 4.52932e-01 78 2021 8 5.89040e+01 1.43918e+00 128 2021 9 5.12811e+01 7.83250e-01 80 2021 10 4.51399e+01 1.86729e+00 98 2021 11 3.70788e+01 1.79168e+00 193 2021 12 3.40679e+01 4.68769e-01 256 2022 1 3.64921e+01 1.80113e+00 112 2022 2 4.22491e+01 1.99420e+00 154 2022 3 4.95188e+01 2.03958e+00 48 2022 4 6.02325e+01 2.32328e-02 16 2022 5 6.15376e+01 6.51971e-01 107 2022 6 6.33027e+01 3.78738e-01 58 2022 7 6.30476e+01 2.79518e-01 79 2022 8 5.93765e+01 1.41173e+00 72 2022 9 5.34819e+01 1.60927e+00 96 2022 10 4.50036e+01 2.35838e+00 161 2022 11 3.76376e+01 1.91087e+00 198 2022 12 3.38461e+01 4.67880e-01 171 2023 1 3.54782e+01 8.94874e-01 201 2023 2 4.39374e+01 2.35989e+00 202 2023 3 4.99885e+01 2.28183e+00 102 2023 4 5.82584e+01 1.43022e+00 57 2023 5 6.12268e+01 2.70389e-01 79 2023 6 6.34766e+01 2.10237e-01 59 2023 7 6.31278e+01 1.58664e-01 32 2023 8 5.89457e+01 7.61170e-01 44 2023 9 5.42552e+01 1.95016e+00 95 2023 10 4.60002e+01 2.27303e+00 139 2023 11 3.81796e+01 1.71900e+00 109 2023 12 3.38124e+01 4.76340e-01 57 2024 1 3.73622e+01 1.58904e+00 49 2024 2 4.28328e+01 2.47949e+00 115 2024 3 5.19027e+01 2.55878e+00 99 2024 4 5.49639e+01 3.45220e-02 16