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 6.13681e+01 9.14118e-01 96 2002 8 5.78711e+01 8.37018e-01 108 2002 9 5.07775e+01 2.20655e+00 96 2002 10 4.37025e+01 2.20008e+00 159 2002 11 3.37554e+01 1.97597e+00 160 2002 12 2.99744e+01 5.37518e-01 216 2003 1 3.17659e+01 1.45023e+00 208 2003 2 3.93494e+01 2.41959e+00 182 2003 3 5.16966e+01 1.85431e+00 112 2003 4 5.73140e+01 2.03413e+00 176 2003 5 6.18539e+01 9.17210e-01 96 2003 6 6.29163e+01 1.16300e-01 66 2003 7 6.12676e+01 7.05317e-01 64 2003 8 5.76067e+01 1.54632e+00 119 2003 9 5.16301e+01 2.08647e+00 143 2003 10 4.25115e+01 2.55512e+00 240 2003 11 3.42767e+01 2.18720e+00 240 2003 12 2.98326e+01 4.67672e-01 192 2004 1 3.22589e+01 1.39505e+00 178 2004 2 4.23080e+01 1.55276e+00 64 2004 3 5.01539e+01 2.03358e+00 208 2004 4 5.71242e+01 1.74419e+00 176 2004 5 6.17159e+01 7.93852e-01 206 2004 6 6.28608e+01 4.40323e-02 76 2004 7 6.22325e+01 3.40763e-01 112 2004 8 5.80184e+01 1.44566e+00 160 2004 9 5.07045e+01 2.24790e+00 96 2004 10 4.31866e+01 2.55024e+00 111 2004 11 3.46258e+01 1.83350e+00 144 2004 12 2.95828e+01 1.79413e-01 172 2005 1 3.24225e+01 1.58371e+00 176 2005 2 3.91497e+01 1.52053e+00 128 2005 3 4.87517e+01 2.77106e+00 192 2005 4 5.74348e+01 1.20565e+00 144 2005 5 6.16773e+01 6.78084e-01 126 2005 6 6.30131e+01 1.49645e-01 80 2005 7 6.15619e+01 6.38202e-01 144 2005 8 5.80917e+01 3.94573e-01 64 2005 9 4.99496e+01 2.74608e+00 64 2005 10 4.18970e+01 2.49901e+00 208 2005 11 3.43612e+01 1.91862e+00 256 2005 12 2.98587e+01 4.84808e-01 162 2006 1 3.24296e+01 1.92396e+00 174 2006 2 4.06273e+01 2.74148e+00 176 2006 3 4.91946e+01 2.97981e+00 269 2006 4 5.73802e+01 1.90480e+00 176 2006 5 6.16737e+01 8.14471e-01 217 2006 6 6.30173e+01 1.12127e-01 160 2006 7 6.16632e+01 6.94134e-01 128 2006 8 5.84063e+01 1.65936e+00 144 2006 9 5.05872e+01 2.81006e+00 135 2006 10 4.33848e+01 2.82066e+00 243 2006 11 3.44203e+01 2.07568e+00 224 2006 12 2.99803e+01 5.50282e-01 144 2007 1 3.22485e+01 1.74103e+00 96 2007 2 4.00736e+01 2.17409e+00 176 2007 3 4.95346e+01 2.70819e+00 304 2007 4 5.77695e+01 2.17082e+00 184 2007 5 6.16064e+01 8.25482e-01 208 2007 6 6.29206e+01 2.47272e-01 112 2007 7 6.16863e+01 5.73103e-01 89 2007 8 5.75262e+01 1.41513e+00 112 2007 9 4.88678e+01 1.49953e+00 77 2007 10 4.38709e+01 1.83799e+00 160 2007 11 3.47734e+01 1.93339e+00 277 2007 12 2.99054e+01 3.49006e-01 98 2008 1 3.20681e+01 2.02155e+00 192 2008 2 3.97866e+01 2.91857e+00 256 2008 3 5.08085e+01 2.61486e+00 192 2008 4 5.87776e+01 1.24832e+00 192 2008 5 6.18882e+01 8.54270e-01 192 2008 6 6.29863e+01 1.54275e-01 184 2008 7 6.13321e+01 6.75437e-01 86 2008 8 5.81213e+01 1.65855e+00 64 2008 9 5.07286e+01 2.12651e+00 146 2008 10 4.22207e+01 2.64290e+00 294 2008 11 3.48770e+01 1.86602e+00 224 2008 12 2.96425e+01 4.00716e-01 197 2009 1 3.22914e+01 1.64170e+00 208 2009 2 3.96810e+01 2.69487e+00 221 2009 3 4.76547e+01 1.84804e+00 180 2009 4 5.83772e+01 1.93020e+00 128 2009 5 6.17054e+01 9.09729e-01 128 2009 6 6.29683e+01 4.88307e-02 64 2009 7 6.18721e+01 2.44036e-01 80 2009 8 5.71087e+01 1.15348e+00 80 2009 9 5.05769e+01 2.37729e+00 124 2009 10 4.27597e+01 2.43748e+00 180 2009 11 3.41995e+01 2.12424e+00 186 2009 12 2.97582e+01 2.30261e-01 68 2010 1 3.17640e+01 1.60954e+00 164 2010 2 4.08502e+01 2.23311e+00 160 2010 3 4.94188e+01 2.93063e+00 208 2010 4 5.73436e+01 1.89649e+00 192 2010 5 6.17609e+01 7.47697e-01 144 2010 6 6.28168e+01 9.00394e-02 112 2010 7 6.15670e+01 8.10517e-01 78 2010 8 5.87891e+01 1.29919e+00 61 2010 9 5.14021e+01 2.23068e+00 224 2010 10 4.26256e+01 2.68314e+00 368 2010 11 3.43593e+01 1.81559e+00 306 2010 12 3.00428e+01 5.33910e-01 240 2011 1 3.23793e+01 1.62726e+00 237 2011 2 4.11752e+01 1.77633e+00 208 2011 3 4.90963e+01 2.25886e+00 208 2011 4 5.74020e+01 1.90895e+00 208 2011 5 6.17636e+01 8.13463e-01 224 2011 6 6.29557e+01 1.57955e-01 160 2011 7 6.17151e+01 7.42026e-01 128 2011 8 5.73881e+01 1.39439e+00 176 2011 9 5.12500e+01 2.41841e+00 126 2011 10 4.31535e+01 2.73043e+00 256 2011 11 3.49371e+01 2.03575e+00 225 2011 12 3.00149e+01 5.57675e-01 161 2012 1 3.22597e+01 1.83808e+00 233 2012 2 4.05760e+01 1.25575e+00 33 2012 3 4.96563e+01 2.21040e+00 210 2012 4 5.74941e+01 1.92330e+00 208 2012 5 6.19402e+01 7.63929e-01 158 2012 6 6.30359e+01 1.56408e-01 104 2012 7 6.17934e+01 5.71369e-01 65 2012 8 5.74336e+01 1.07501e+00 112 2012 9 5.10445e+01 2.68051e+00 96 2012 10 4.12168e+01 1.98856e+00 222 2012 11 3.47389e+01 2.04391e+00 240 2012 12 2.99143e+01 6.08468e-01 136 2013 1 3.33218e+01 1.38606e+00 160 2013 2 4.01753e+01 3.12563e+00 112 2013 3 5.00926e+01 2.75486e+00 176 2013 4 5.68592e+01 1.62415e+00 96 2013 5 6.19801e+01 5.96583e-01 176 2013 6 6.29256e+01 5.13902e-02 96 2013 7 6.16152e+01 4.89238e-03 16 2013 8 5.71453e+01 1.40214e+00 110 2013 9 5.12977e+01 2.29196e+00 219 2013 10 4.19788e+01 2.13439e+00 202 2013 11 3.35911e+01 2.31792e+00 112 2013 12 2.96008e+01 2.24778e-01 131 2014 1 3.22048e+01 1.16722e+00 128 2014 2 4.07675e+01 1.87244e+00 166 2014 3 4.97492e+01 2.61875e+00 143 2014 4 5.79231e+01 1.64650e+00 160 2014 5 6.17603e+01 7.13812e-01 160 2014 6 6.28965e+01 7.38805e-02 115 2014 7 6.13642e+01 7.24865e-01 100 2014 8 5.78342e+01 1.47426e+00 176 2014 9 5.18214e+01 2.09210e+00 176 2014 10 4.25214e+01 2.61163e+00 292 2014 11 3.41645e+01 2.34962e+00 208 2014 12 2.99545e+01 4.37709e-01 192 2015 1 3.29415e+01 1.96913e+00 159 2015 2 3.86604e+01 1.49334e+00 176 2015 3 4.99454e+01 2.69721e+00 144 2015 4 5.66739e+01 1.87349e+00 59 2015 5 6.15477e+01 9.17230e-01 192 2015 6 6.28712e+01 1.45640e-01 155 2015 7 6.17287e+01 6.72392e-01 80 2015 8 5.71098e+01 1.56832e+00 86 2015 9 5.06356e+01 1.19769e+00 96 2015 10 4.23721e+01 2.47953e+00 240 2015 11 3.39863e+01 2.19988e+00 175 2015 12 3.00431e+01 4.18123e-01 144 2016 1 3.26191e+01 1.55980e+00 112 2016 2 4.04396e+01 2.58857e+00 272 2016 3 4.87585e+01 2.00112e+00 168 2016 4 5.68679e+01 1.79089e+00 124 2016 5 6.17015e+01 7.41953e-01 176 2016 6 6.29361e+01 1.05963e-01 121 2016 7 6.16182e+01 7.04098e-01 142 2016 8 5.68091e+01 6.67689e-01 92 2016 9 5.04006e+01 2.70862e+00 155 2016 10 4.21128e+01 2.52224e+00 288 2016 11 3.40988e+01 1.60557e+00 208 2016 12 2.96437e+01 4.05998e-01 208 2017 1 3.21001e+01 1.69812e+00 174 2017 2 4.05448e+01 2.49234e+00 270 2017 3 5.01607e+01 2.63566e+00 221 2017 4 5.70023e+01 1.49020e+00 160 2017 5 6.18577e+01 7.93247e-01 112 2017 6 6.28258e+01 1.65278e-01 64 2017 7 6.16549e+01 7.67070e-01 144 2017 8 5.79606e+01 1.70898e+00 60 2017 9 5.05333e+01 2.28067e+00 192 2017 10 4.16145e+01 2.60848e+00 218 2017 11 3.43298e+01 2.18098e+00 240 2017 12 2.98004e+01 1.86233e-01 128 2018 1 3.21917e+01 1.78797e+00 208 2018 2 3.92409e+01 2.22688e+00 42 2018 3 4.90419e+01 2.88081e+00 254 2018 4 5.79761e+01 1.72133e+00 202 2018 5 6.15109e+01 8.22898e-01 171 2018 6 6.28246e+01 1.00785e-01 112 2018 7 6.14864e+01 5.95738e-01 86 2018 8 5.78054e+01 1.64076e+00 88 2018 9 5.04042e+01 1.57241e+00 115 2018 10 4.19827e+01 2.79070e+00 222 2018 11 3.37670e+01 1.89903e+00 80 2018 12 3.00757e+01 4.19656e-01 125 2019 1 3.18973e+01 1.51586e+00 176 2019 2 4.02191e+01 2.25963e+00 51 2019 3 5.05197e+01 2.57811e+00 224 2019 4 5.85705e+01 5.74094e-01 80 2019 5 6.18541e+01 7.61858e-01 193 2019 6 6.29748e+01 1.42086e-01 80 2019 7 6.13753e+01 8.63359e-01 138 2019 8 5.82541e+01 1.70690e+00 144 2019 9 5.08809e+01 2.78404e+00 240 2019 10 4.42058e+01 2.49826e+00 128 2019 11 3.35867e+01 1.93265e+00 192 2019 12 2.98449e+01 3.48011e-01 70 2020 1 3.18514e+01 1.74567e+00 144 2020 2 4.05589e+01 3.25690e+00 160 2020 3 4.94020e+01 2.34779e+00 166 2020 4 5.81566e+01 2.12883e+00 144 2020 5 6.14343e+01 7.69046e-01 120 2020 6 6.30875e+01 1.06225e-01 128 2020 7 6.10575e+01 7.88870e-01 64 2020 8 5.98707e+01 3.59859e-01 48 2020 9 5.16436e+01 2.53538e+00 80 2020 10 4.20872e+01 2.63972e+00 212 2020 11 3.44392e+01 1.84300e+00 266 2020 12 2.98593e+01 4.81880e-01 256 2021 1 3.24473e+01 1.78870e+00 123 2021 2 4.06456e+01 3.28740e+00 124 2021 3 4.91529e+01 2.24916e+00 158 2021 4 5.69531e+01 2.13046e+00 175 2021 5 6.19110e+01 7.13349e-01 133 2021 6 6.29315e+01 6.60585e-02 48 2021 7 6.11488e+01 4.60628e-01 112 2021 8 5.86963e+01 8.38807e-01 130 2021 9 5.05974e+01 2.61764e+00 84 2021 10 4.12441e+01 2.01104e+00 112 2021 11 3.43549e+01 1.94461e+00 224 2021 12 2.96742e+01 4.91935e-01 105 2022 1 3.20427e+01 1.71037e+00 176 2022 2 4.08514e+01 1.93994e+00 185 2022 3 4.96310e+01 2.94253e+00 254 2022 4 5.90884e+01 6.39735e-01 64 2022 5 6.18739e+01 9.13012e-01 159 2022 6 6.29355e+01 1.62024e-01 176 2022 7 6.11439e+01 8.05894e-01 50 2022 8 5.71695e+01 1.55223e+00 160 2022 9 5.03223e+01 1.79159e+00 107 2022 10 4.28387e+01 2.62465e+00 282 2022 11 3.48266e+01 2.23656e+00 190 2022 12 2.98169e+01 5.49545e-01 144 2023 1 3.24184e+01 1.71045e+00 224 2023 2 4.01563e+01 2.81012e+00 223 2023 3 4.88702e+01 2.28719e+00 161 2023 4 5.80306e+01 1.43529e+00 91 2023 5 6.15339e+01 6.87620e-01 144 2023 6 6.29653e+01 1.61910e-01 128 2023 7 6.14281e+01 9.96328e-01 112 2023 8 5.75766e+01 1.36459e+00 156 2023 9 5.14166e+01 1.43409e+00 128 2023 10 4.10467e+01 2.10630e+00 208 2023 11 3.46900e+01 1.96074e+00 160 2023 12 2.96460e+01 3.95580e-01 96 2024 1 3.21525e+01 1.85633e+00 96 2024 2 4.16016e+01 2.03968e+00 176 2024 3 5.19096e+01 2.05651e+00 80 2024 4 nan nan 0