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 6.09800e+01 2.10681e-01 222 2002 8 5.81903e+01 1.09868e+00 31 2002 9 5.25862e+01 9.20131e-01 81 2002 10 4.57212e+01 2.43281e+00 151 2002 11 3.88928e+01 1.07524e+00 101 2002 12 3.43432e+01 3.79486e-01 37 2003 1 3.69126e+01 1.16513e+00 119 2003 2 4.23339e+01 1.64571e+00 372 2003 3 5.15700e+01 2.29550e+00 479 2003 4 5.82567e+01 7.76715e-01 327 2003 5 6.13587e+01 7.42853e-01 292 2003 6 6.20128e+01 7.48474e-02 29 2003 7 6.15080e+01 3.65795e-01 81 2003 8 5.94284e+01 9.03014e-01 92 2003 9 5.31029e+01 1.05237e+00 184 2003 10 4.50858e+01 1.53184e+00 219 2003 11 3.66538e+01 7.70993e-01 82 2003 12 3.41834e+01 3.62958e-01 51 2004 1 3.63400e+01 1.53272e+00 70 2004 2 4.44066e+01 1.75135e+00 140 2004 3 5.27826e+01 2.61212e+00 304 2004 4 5.71351e+01 1.28310e+00 164 2004 5 6.13455e+01 1.43513e+00 132 2004 6 6.21525e+01 3.31655e-01 347 2004 7 6.09094e+01 5.53471e-01 193 2004 8 5.81765e+01 1.31601e+00 435 2004 9 5.00914e+01 6.97597e-01 96 2004 10 4.68111e+01 2.23296e+00 189 2004 11 3.85939e+01 1.81356e+00 142 2004 12 3.41507e+01 3.87450e-01 40 2005 1 3.61843e+01 1.72501e+00 134 2005 2 4.30299e+01 1.93098e+00 152 2005 3 5.22002e+01 1.65839e+00 259 2005 4 5.64255e+01 1.26608e+00 127 2005 5 6.19676e+01 3.46250e-01 298 2005 6 6.18876e+01 3.50814e-01 85 2005 7 6.13860e+01 4.59798e-01 75 2005 8 5.79065e+01 1.92792e+00 147 2005 9 5.40755e+01 9.62214e-01 373 2005 10 4.50872e+01 1.40800e+00 54 2005 11 3.71016e+01 1.65279e+00 93 2005 12 3.42289e+01 4.22821e-01 550 2006 1 3.53233e+01 1.01344e+00 496 2006 2 4.52974e+01 1.61881e+00 43 2006 3 5.04070e+01 2.47224e+00 216 2006 4 5.88328e+01 1.37536e+00 148 2006 5 6.18086e+01 7.99237e-01 318 2006 6 6.20524e+01 3.08535e-01 335 2006 7 6.06015e+01 3.08834e-01 97 2006 8 5.85601e+01 6.02929e-01 120 2006 9 5.10103e+01 8.90292e-01 277 2006 10 4.50882e+01 2.26341e+00 229 2006 11 3.80909e+01 1.43037e+00 128 2006 12 3.44208e+01 4.75888e-01 42 2007 1 3.64977e+01 1.62377e+00 180 2007 2 4.24029e+01 1.03263e+00 26 2007 3 5.14545e+01 2.11177e+00 94 2007 4 5.81052e+01 1.40892e+00 184 2007 5 6.08043e+01 4.41404e-01 93 2007 6 6.16302e+01 5.02416e-01 200 2007 7 6.10916e+01 6.60712e-01 202 2007 8 5.98959e+01 1.03936e+00 117 2007 9 5.29390e+01 1.66749e+00 108 2007 10 4.64380e+01 1.36634e+00 80 2007 11 3.88636e+01 2.12264e+00 170 2007 12 3.42048e+01 4.46054e-01 101 2008 1 3.62635e+01 2.02502e+00 77 2008 2 4.34913e+01 2.81567e+00 141 2008 3 4.98760e+01 2.08234e+00 187 2008 4 5.80331e+01 1.39623e+00 212 2008 5 6.10820e+01 1.42175e+00 211 2008 6 6.21088e+01 7.50524e-02 154 2008 7 6.02683e+01 2.93848e-01 215 2008 8 5.94312e+01 4.28858e-01 215 2008 9 5.36378e+01 1.38472e+00 88 2008 10 4.59441e+01 1.98672e+00 137 2008 11 3.75513e+01 1.57418e+00 208 2008 12 3.43469e+01 3.25173e-01 46 2009 1 3.63582e+01 1.53300e+00 50 2009 2 4.41963e+01 1.49087e+00 31 2009 3 5.14760e+01 1.58657e+00 170 2009 4 5.75179e+01 1.33641e+00 283 2009 5 6.12728e+01 9.12350e-01 82 2009 6 6.20818e+01 1.42874e-01 288 2009 7 6.11942e+01 6.09502e-01 283 2009 8 5.86294e+01 6.78606e-01 45 2009 9 5.38634e+01 1.91831e+00 70 2009 10 4.79516e+01 1.13314e+00 363 2009 11 3.71316e+01 1.18440e+00 111 2009 12 3.41949e+01 4.73519e-01 91 2010 1 3.49807e+01 6.08701e-01 12 2010 2 4.32204e+01 1.08317e+00 215 2010 3 5.23430e+01 2.32730e+00 473 2010 4 5.69557e+01 1.09676e+00 241 2010 5 6.20438e+01 3.51965e-01 170 2010 6 6.20923e+01 2.46750e-01 147 2010 7 6.09250e+01 5.46874e-01 89 2010 8 5.88455e+01 7.39706e-01 150 2010 9 5.52187e+01 7.73662e-01 29 2010 10 4.63272e+01 2.40242e+00 209 2010 11 3.76452e+01 1.54363e+00 96 2010 12 3.42491e+01 5.07098e-01 102 2011 1 3.57350e+01 1.71278e+00 184 2011 2 4.38824e+01 1.17712e+00 94 2011 3 5.23824e+01 2.82017e+00 81 2011 4 5.76474e+01 1.50923e+00 236 2011 5 6.15655e+01 7.66816e-01 369 2011 6 6.21386e+01 1.83912e-01 181 2011 7 6.09842e+01 3.84261e-01 163 2011 8 5.97408e+01 5.36912e-01 51 2011 9 5.46138e+01 5.10846e-01 218 2011 10 4.66594e+01 8.93941e-01 35 2011 11 3.67880e+01 2.20167e+00 109 2011 12 3.39265e+01 8.74926e-01 66 2012 1 3.71474e+01 1.05890e+00 33 2012 2 4.46010e+01 1.99490e+00 71 2012 3 5.08300e+01 2.73558e+00 269 2012 4 5.71127e+01 7.57275e-01 209 2012 5 6.14306e+01 3.41630e-01 152 2012 6 6.18790e+01 3.05787e-01 247 2012 7 6.01422e+01 5.70086e-01 81 2012 8 5.92414e+01 6.85076e-01 253 2012 9 5.35911e+01 2.48368e+00 142 2012 10 4.45527e+01 1.66844e+00 110 2012 11 3.96249e+01 2.16089e+00 133 2012 12 3.40466e+01 1.92423e-01 127 2013 1 3.73572e+01 1.47689e+00 126 2013 2 4.24041e+01 1.93149e+00 214 2013 3 5.28048e+01 2.10054e+00 258 2013 4 5.78077e+01 8.24307e-01 156 2013 5 6.15479e+01 3.55312e-01 166 2013 6 6.20940e+01 9.64451e-02 63 2013 7 6.02762e+01 1.18160e-01 91 2013 8 5.84277e+01 1.24524e+00 31 2013 9 5.37166e+01 1.52081e+00 136 2013 10 4.60224e+01 1.79917e+00 140 2013 11 3.75260e+01 1.83494e+00 86 2013 12 3.37628e+01 8.20548e-01 100 2014 1 3.60929e+01 1.77062e+00 53 2014 2 4.32321e+01 1.93913e+00 136 2014 3 5.01452e+01 1.11323e+00 172 2014 4 5.89049e+01 9.59946e-01 161 2014 5 6.09535e+01 4.51230e-01 146 2014 6 6.19423e+01 2.11632e-01 179 2014 7 6.07028e+01 5.83838e-01 237 2014 8 5.91360e+01 9.55288e-01 682 2014 9 5.40508e+01 1.36751e+00 91 2014 10 4.62373e+01 2.03990e+00 189 2014 11 3.73393e+01 1.53920e+00 24 2014 12 3.39697e+01 1.63003e-01 132 2015 1 3.73778e+01 1.86773e+00 137 2015 2 4.22622e+01 2.69831e+00 132 2015 3 5.07429e+01 1.90337e+00 146 2015 4 5.58603e+01 7.52527e-01 98 2015 5 6.11058e+01 6.74715e-01 195 2015 6 6.20695e+01 8.33189e-02 65 2015 7 6.09226e+01 1.89228e-01 157 2015 8 5.91683e+01 9.98984e-01 490 2015 9 5.35138e+01 2.10962e+00 304 2015 10 4.75213e+01 1.74056e+00 410 2015 11 3.66885e+01 3.36220e+00 109 2015 12 3.38949e+01 3.22212e-01 95 2016 1 3.45421e+01 6.63273e-01 85 2016 2 4.31318e+01 2.56043e+00 34 2016 3 5.02114e+01 2.05975e+00 177 2016 4 5.61078e+01 1.55037e+00 100 2016 5 6.12099e+01 7.74903e-01 172 2016 6 6.19811e+01 1.45168e-01 167 2016 7 6.11923e+01 4.41725e-01 204 2016 8 5.83028e+01 7.45872e-01 114 2016 9 5.21118e+01 2.01929e+00 339 2016 10 4.72490e+01 1.54046e+00 100 2016 11 3.84805e+01 1.30891e+00 73 2016 12 3.39186e+01 1.83716e-01 39 2017 1 3.70803e+01 1.12533e+00 173 2017 2 4.49447e+01 1.43947e+00 64 2017 3 5.10881e+01 2.47581e+00 145 2017 4 5.89115e+01 1.18359e+00 145 2017 5 6.15719e+01 6.73803e-01 212 2017 6 6.21285e+01 8.21123e-02 31 2017 7 6.01256e+01 1.47931e+00 118 2017 8 5.86972e+01 1.01166e+00 322 2017 9 5.15918e+01 8.20480e-01 106 2017 10 4.50462e+01 2.00662e+00 151 2017 11 3.72487e+01 1.57586e+00 300 2017 12 3.41041e+01 3.25123e-01 159 2018 1 3.63713e+01 1.85912e+00 43 2018 2 4.36966e+01 1.69514e+00 313 2018 3 5.10236e+01 2.31348e+00 252 2018 4 5.78214e+01 1.71096e+00 388 2018 5 6.11318e+01 2.36204e-01 28 2018 6 6.20494e+01 1.65698e-01 335 2018 7 6.08860e+01 4.13324e-01 516 2018 8 5.85150e+01 5.96578e-01 219 2018 9 5.18100e+01 1.47422e+00 312 2018 10 4.78823e+01 2.24316e+00 110 2018 11 3.89233e+01 8.83121e-01 79 2018 12 3.27689e+01 6.96390e-01 131 2019 1 3.57138e+01 1.00541e+00 51 2019 2 4.50639e+01 1.89053e+00 199 2019 3 5.23054e+01 2.54728e+00 214 2019 4 5.88092e+01 8.79512e-01 85 2019 5 6.10890e+01 9.21562e-01 152 2019 6 6.20819e+01 2.03805e-01 383 2019 7 6.07951e+01 5.53856e-01 224 2019 8 5.89179e+01 5.80516e-01 278 2019 9 5.29668e+01 1.37677e+00 128 2019 10 4.46306e+01 1.54789e+00 161 2019 11 3.72616e+01 1.35066e+00 125 2019 12 3.42492e+01 2.85885e-01 73 2020 1 3.61464e+01 1.28150e+00 180 2020 2 4.37351e+01 1.86322e+00 117 2020 3 5.26180e+01 1.98880e+00 244 2020 4 5.76132e+01 1.20752e+00 88 2020 5 6.20549e+01 2.50553e-01 184 2020 6 6.17614e+01 5.58192e-01 204 2020 7 6.11022e+01 2.69575e-01 260 2020 8 5.87173e+01 1.11730e+00 127 2020 9 5.16648e+01 1.02573e+00 95 2020 10 4.56354e+01 1.57945e+00 65 2020 11 3.59815e+01 8.47415e-01 53 2020 12 3.38512e+01 4.89661e-01 58 2021 1 3.53480e+01 3.13453e+00 21 2021 2 4.23629e+01 1.29210e+00 160 2021 3 5.28848e+01 1.87486e+00 226 2021 4 5.82218e+01 1.23151e+00 137 2021 5 6.11350e+01 5.46101e-01 149 2021 6 6.19173e+01 3.65542e-01 34 2021 7 6.14649e+01 6.41579e-01 110 2021 8 5.74512e+01 1.85531e-01 45 2021 9 5.38358e+01 1.93203e+00 273 2021 10 4.29087e+01 1.45185e+00 153 2021 11 4.01495e+01 1.66870e+00 136 2021 12 3.38751e+01 3.95544e-01 113 2022 1 3.52699e+01 1.07544e+00 57 2022 2 4.59197e+01 1.63473e+00 137 2022 3 5.10311e+01 2.45645e+00 116 2022 4 5.95078e+01 5.50822e-01 24 2022 5 6.14533e+01 4.60614e-01 128 2022 6 6.20059e+01 9.47373e-02 113 2022 7 6.11705e+01 2.29413e-01 118 2022 8 5.91861e+01 1.13341e+00 25 2022 9 5.35285e+01 1.49723e+00 394 2022 10 4.37168e+01 1.93846e+00 119 2022 11 3.74230e+01 1.62470e+00 258 2022 12 3.42261e+01 4.73951e-01 145 2023 1 3.60180e+01 1.53557e+00 131 2023 2 4.55965e+01 2.51015e+00 229 2023 3 4.98076e+01 2.05024e+00 337 2023 4 5.75214e+01 1.22524e+00 48 2023 5 6.10903e+01 5.36291e-01 362 2023 6 6.20034e+01 1.80193e-01 162 2023 7 6.13844e+01 2.51771e-01 320 2023 8 5.98556e+01 3.67609e-01 242 2023 9 5.30863e+01 1.00019e+00 213 2023 10 4.62143e+01 1.77378e+00 126 2023 11 3.82921e+01 1.94189e+00 109 2023 12 3.39797e+01 5.63601e-01 66 2024 1 3.85196e+01 8.71380e-01 64 2024 2 4.42357e+01 2.48349e+00 139 2024 3 5.21431e+01 2.23878e+00 17 2024 4 nan nan 0