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 2.47197e+01 2.81100e+00 121 2002 8 2.28919e+01 1.93252e+00 128 2002 9 7.07137e+00 6.79675e+00 96 2002 10 7.39665e+00 6.20883e+00 144 2002 11 3.35342e+00 2.58827e+00 190 2002 12 3.07222e+00 1.45581e+00 176 2003 1 1.89523e+00 2.12353e+00 224 2003 2 5.34433e+00 3.76759e+00 160 2003 3 2.34465e+00 1.59508e+00 128 2003 4 4.92955e+00 2.87482e+00 120 2003 5 1.07291e+01 5.64670e+00 80 2003 6 5.05164e+00 1.52512e+00 50 2003 7 8.62453e+00 4.41141e+00 95 2003 8 1.00504e+01 4.61934e+00 126 2003 9 1.32622e+01 5.93946e+00 202 2003 10 7.69774e+00 3.56903e+00 183 2003 11 1.51510e+01 5.52453e+00 269 2003 12 6.24927e+00 3.62905e+00 232 2004 1 1.14651e+01 3.69160e+00 139 2004 2 1.02882e+01 2.02281e+00 80 2004 3 1.05597e+01 3.35979e+00 242 2004 4 1.20172e+01 5.10043e+00 160 2004 5 2.12970e+01 5.02207e+00 160 2004 6 8.54051e+00 6.65958e+00 48 2004 7 8.54236e+00 3.93875e+00 96 2004 8 1.02082e+01 3.61618e+00 80 2004 9 7.76075e+00 6.47588e+00 192 2004 10 7.89887e+00 4.26224e+00 128 2004 11 3.19983e+00 1.87651e+00 147 2004 12 2.64872e+00 1.03259e+00 142 2005 1 7.48607e+00 3.28337e+00 167 2005 2 6.81635e+00 2.18929e+00 96 2005 3 8.89672e+00 3.15148e+00 144 2005 4 6.35201e-01 6.98543e-01 112 2005 5 7.01017e+00 5.19166e+00 128 2005 6 1.22095e+01 5.73053e+00 115 2005 7 8.43888e+00 7.30946e+00 134 2005 8 1.49471e+01 7.65718e+00 80 2005 9 1.09825e+01 5.03679e+00 132 2005 10 6.45914e+00 3.26813e+00 304 2005 11 1.23137e+01 4.26651e+00 208 2005 12 1.20455e+01 2.75779e+00 144 2006 1 7.98750e+00 3.10370e+00 160 2006 2 6.49619e+00 3.17743e+00 144 2006 3 1.44049e+01 2.79164e+00 225 2006 4 2.01361e+01 3.30895e+00 192 2006 5 1.52686e+01 7.24781e+00 176 2006 6 1.11973e+01 6.92519e+00 136 2006 7 2.29943e+01 3.10982e+00 63 2006 8 2.04717e+01 2.35569e+00 96 2006 9 1.42685e+01 3.23351e+00 176 2006 10 1.24713e+01 4.35582e+00 260 2006 11 7.20678e+00 3.06081e+00 240 2006 12 1.10362e+01 5.43329e+00 176 2007 1 1.02862e+01 5.01686e+00 96 2007 2 1.29323e+01 2.28479e+00 128 2007 3 1.56458e+01 4.73497e+00 208 2007 4 1.30289e+01 4.34022e+00 129 2007 5 1.84609e+01 3.31389e+00 96 2007 6 2.34244e+01 2.95410e+00 80 2007 7 6.40385e+00 5.98983e+00 64 2007 8 2.22859e+01 3.68068e+00 128 2007 9 1.76742e+01 9.43588e+00 129 2007 10 6.95176e+00 4.44061e+00 255 2007 11 1.18823e+01 2.58651e+00 224 2007 12 1.38316e+01 3.07526e+00 153 2008 1 7.00452e+00 2.35948e+00 96 2008 2 1.20175e+01 3.96761e+00 192 2008 3 3.53610e+00 1.95666e+00 172 2008 4 8.40310e+00 1.67057e+00 144 2008 5 6.91289e+00 5.70095e+00 122 2008 6 4.36310e+00 2.86116e+00 152 2008 7 5.92189e+00 2.83350e+00 60 2008 8 1.15479e+01 3.70915e+00 128 2008 9 1.03946e+01 2.57432e+00 176 2008 10 1.25055e+01 4.06182e+00 208 2008 11 1.72016e+01 3.38776e+00 272 2008 12 1.12421e+01 5.87484e+00 113 2009 1 6.34851e+00 2.94283e+00 192 2009 2 3.19653e+00 2.82507e+00 96 2009 3 1.00097e+01 5.92402e+00 143 2009 4 3.96112e+00 3.33210e+00 112 2009 5 1.01800e+01 5.46441e+00 71 2009 6 5.97319e+00 3.01293e+00 96 2009 7 2.13361e+01 2.62361e+00 80 2009 8 1.93208e+01 1.57490e+00 96 2009 9 1.87298e+01 3.86494e+00 112 2009 10 7.39788e+00 5.16129e+00 192 2009 11 6.61831e+00 2.86224e+00 224 2009 12 2.88100e+00 2.26979e+00 63 2010 1 4.42692e+00 3.31298e+00 159 2010 2 1.13861e+00 2.06600e+00 176 2010 3 2.02267e+00 3.37213e+00 161 2010 4 1.71591e+00 1.60383e+00 192 2010 5 8.43047e+00 2.95222e+00 144 2010 6 3.97257e+00 2.59046e+00 143 2010 7 1.40177e+01 3.80949e+00 112 2010 8 1.09233e+01 2.10872e+00 38 2010 9 1.31400e+01 3.19529e+00 201 2010 10 1.27420e+01 5.00003e+00 345 2010 11 8.11128e+00 2.55341e+00 144 2010 12 3.76770e+00 2.25014e+00 224 2011 1 3.28047e+00 2.39583e+00 210 2011 2 7.45441e+00 3.53679e+00 176 2011 3 1.03864e+01 3.61224e+00 176 2011 4 7.94544e+00 4.57370e+00 131 2011 5 8.86012e+00 5.64843e+00 250 2011 6 5.13364e+00 2.96331e+00 111 2011 7 8.84909e+00 3.71009e+00 109 2011 8 6.13754e+00 3.88911e+00 144 2011 9 6.93244e+00 2.63392e+00 160 2011 10 9.63668e+00 4.61554e+00 287 2011 11 1.04804e+01 2.81332e+00 176 2011 12 1.10021e+01 2.39419e+00 136 2012 1 7.95452e+00 4.43736e+00 208 2012 2 1.27864e+01 2.06190e+00 54 2012 3 1.62479e+01 5.77784e+00 176 2012 4 1.90753e+01 3.27727e+00 179 2012 5 1.96270e+01 4.87814e+00 112 2012 6 2.02930e+01 3.15222e+00 128 2012 7 1.94754e+01 2.45456e+00 80 2012 8 1.02064e+01 1.18870e+00 80 2012 9 8.48184e+00 3.90178e+00 160 2012 10 8.68463e+00 3.01880e+00 293 2012 11 7.87139e+00 3.56608e+00 287 2012 12 1.26956e+01 3.81289e+00 140 2013 1 1.28914e+01 2.10287e+00 89 2013 2 1.40026e+01 1.73402e+00 128 2013 3 1.60918e+00 2.12435e+00 160 2013 4 5.23827e+00 3.24772e+00 64 2013 5 1.02103e+01 5.73577e+00 172 2013 6 1.22268e+01 5.12984e+00 109 2013 7 1.25283e+01 4.24960e+00 128 2013 8 5.59473e+00 3.13508e+00 107 2013 9 9.40639e+00 5.84533e+00 208 2013 10 1.16266e+01 3.20822e+00 240 2013 11 8.30402e+00 2.74788e+00 128 2013 12 1.14665e+01 3.78631e+00 118 2014 1 8.19972e+00 5.41017e+00 128 2014 2 7.14675e+00 3.66738e+00 154 2014 3 5.25626e+00 3.43401e+00 144 2014 4 6.73077e+00 3.85809e+00 96 2014 5 2.17330e+00 1.99346e+00 160 2014 6 4.95607e+00 4.88420e+00 96 2014 7 9.78920e+00 6.36619e+00 139 2014 8 1.89137e+01 2.31352e+00 128 2014 9 2.15703e+01 2.87109e+00 144 2014 10 1.20940e+01 2.99014e+00 320 2014 11 8.07114e+00 2.99495e+00 224 2014 12 8.23235e+00 3.57838e+00 144 2015 1 7.99304e+00 3.82704e+00 160 2015 2 1.07786e+01 3.51793e+00 192 2015 3 1.37876e+01 3.29161e+00 101 2015 4 1.33070e+01 2.80306e+00 48 2015 5 1.91155e+01 7.50453e+00 192 2015 6 1.78369e+01 3.34239e+00 128 2015 7 9.26656e+00 4.17984e+00 128 2015 8 1.47911e+01 4.65505e+00 163 2015 9 1.76658e+01 4.29846e+00 144 2015 10 7.17238e+00 3.13631e+00 192 2015 11 3.86714e+00 2.71163e+00 192 2015 12 4.36079e+00 2.71445e+00 96 2016 1 1.97360e+00 2.61107e+00 160 2016 2 1.12925e+00 1.06354e+00 240 2016 3 1.70275e+00 2.09331e+00 140 2016 4 2.53848e+00 3.37018e+00 160 2016 5 6.91538e+00 5.43888e+00 160 2016 6 8.56799e+00 7.93937e+00 149 2016 7 1.70940e+00 7.12536e-01 128 2016 8 1.59157e+01 1.51330e+00 108 2016 9 1.52557e+01 3.90888e+00 226 2016 10 1.25394e+01 3.16968e+00 288 2016 11 1.45166e+01 3.12332e+00 234 2016 12 1.19854e+01 2.09814e+00 176 2017 1 6.91903e+00 6.30799e+00 204 2017 2 2.72553e+00 1.51069e+00 240 2017 3 7.76670e+00 4.52243e+00 160 2017 4 9.11581e+00 3.81113e+00 177 2017 5 5.75021e+00 3.89495e+00 144 2017 6 1.15324e+01 7.85683e+00 64 2017 7 8.52099e+00 4.90012e+00 141 2017 8 8.83541e+00 5.27562e+00 104 2017 9 7.53193e+00 3.85853e+00 192 2017 10 6.31745e+00 3.07380e+00 233 2017 11 9.73867e+00 3.96848e+00 256 2017 12 1.07323e+01 4.43402e+00 144 2018 1 7.49598e+00 3.88056e+00 220 2018 2 1.57369e+01 6.47886e+00 96 2018 3 1.47897e+01 5.57663e+00 192 2018 4 1.47802e+01 5.15669e+00 213 2018 5 7.40993e+00 4.08648e+00 96 2018 6 9.16656e+00 4.03782e+00 85 2018 7 9.79658e+00 1.87821e+00 80 2018 8 1.17422e+01 3.02841e+00 96 2018 9 1.33240e+01 5.71415e+00 168 2018 10 9.50590e+00 9.24976e+00 288 2018 11 2.66872e+00 1.32011e+00 96 2018 12 2.48793e+00 2.04387e+00 128 2019 1 1.02231e+00 1.20155e+00 176 2019 2 2.25911e+00 2.33428e+00 63 2019 3 4.91313e+00 3.25223e+00 176 2019 4 7.87935e+00 3.21320e+00 108 2019 5 1.15624e+01 2.91388e+00 219 2019 6 8.15001e+00 2.97578e+00 91 2019 7 4.68616e+00 3.30520e+00 127 2019 8 9.90899e+00 3.32857e+00 128 2019 9 6.20897e+00 2.89182e+00 313 2019 10 1.03017e+01 3.17893e+00 176 2019 11 1.01756e+01 3.04476e+00 184 2019 12 9.85047e+00 1.67852e+00 144 2020 1 9.49701e+00 2.61978e+00 118 2020 2 9.51473e+00 3.92811e+00 144 2020 3 6.38805e+00 3.85749e+00 99 2020 4 2.77710e+00 2.13003e+00 128 2020 5 2.32344e+00 3.45811e+00 169 2020 6 1.54118e+01 5.86524e+00 92 2020 7 9.63428e+00 3.81222e+00 64 2020 8 8.36266e+00 2.53439e+00 80 2020 9 1.50250e+00 2.34280e+00 96 2020 10 2.16848e+00 2.63017e+00 223 2020 11 4.19228e+00 4.17500e+00 228 2020 12 7.63711e+00 3.43879e+00 209 2021 1 6.35121e+00 3.50078e+00 144 2021 2 7.04260e+00 1.90218e+00 96 2021 3 9.65747e+00 4.62480e+00 116 2021 4 1.04055e+01 5.06166e+00 191 2021 5 1.12630e+01 4.91779e+00 149 2021 6 1.37812e+01 3.67469e+00 47 2021 7 7.65361e+00 5.66818e+00 135 2021 8 6.67716e+00 5.19888e+00 168 2021 9 3.99366e+00 3.68922e+00 128 2021 10 2.38252e+00 1.94021e+00 108 2021 11 7.12993e+00 3.72373e+00 238 2021 12 9.43194e+00 3.39252e+00 153 2022 1 6.92788e+00 1.86698e+00 160 2022 2 1.30055e+01 4.53399e+00 208 2022 3 1.52720e+01 2.89022e+00 208 2022 4 2.13515e+01 3.77944e+00 94 2022 5 2.13366e+01 7.58182e+00 160 2022 6 2.34010e+01 3.68346e+00 159 2022 7 2.19407e+01 5.83862e+00 128 2022 8 6.92602e+00 2.99638e+00 132 2022 9 1.16442e+01 3.69536e+00 231 2022 10 1.17515e+01 3.24905e+00 275 2022 11 1.14618e+01 3.95422e+00 171 2022 12 1.26815e+01 4.29362e+00 127 2023 1 1.56245e+01 3.82389e+00 208 2023 2 1.23274e+01 3.82453e+00 144 2023 3 1.02856e+01 1.71349e+00 80 2023 4 1.51048e+01 4.00087e+00 66 2023 5 2.56112e+01 3.89830e+00 143 2023 6 2.03652e+01 6.89931e+00 73 2023 7 8.74885e+00 4.68271e+00 136 2023 8 9.86180e+00 3.92692e+00 160 2023 9 6.24720e+00 4.17939e+00 144 2023 10 6.29439e+00 4.08428e+00 267 2023 11 7.41000e+00 2.20741e+00 195 2023 12 6.59881e+00 2.14577e+00 103 2024 1 5.51315e+00 3.50611e+00 96 2024 2 4.82294e+00 2.80144e+00 112 2024 3 4.11237e+00 2.52169e+00 96 2024 4 5.94093e+00 3.63844e+00 32