Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1281      519       29.318356  29.620291  29.467426  0.081919   29.460711 
2008            1281      519       29.937517  30.43087   30.176401  0.11478    30.179903 
2009            1281      519       29.425936  29.825161  29.736185  0.064192   29.745871 
2010            1281      519       29.766001  30.030968  29.909661  0.052065   29.893    
2011            1281      519       30.290419  30.526968  30.45444   0.046872   30.460678 
2012            1281      519       29.766323  29.924644  29.873841  0.026421   29.878775 
2013            1281      519       29.00713   29.307129  29.218257  0.044671   29.22271  
2014            1281      519       29.57629   29.853323  29.749053  0.052566   29.753515 
2015            1281      519       30.365257  30.716387  30.590541  0.059743   30.602709 
2016            1281      519       30.366161  30.699259  30.542781  0.103483   30.547613 
2017            1281      519       30.181581  30.320871  30.249706  0.031366   30.25013  
2018            1281      519       29.814322  30.02442   29.942838  0.038026   29.950129 
2019            1281      519       29.612484  29.865969  29.748764  0.05686    29.74342  
2020            1281      519       29.204161  29.624838  29.483831  0.096236   29.494741 
2021            1281      519       29.624063  29.81271   29.760455  0.027281   29.761419 
2022            1281      519       30.599258  30.980871  30.823146  0.096482   30.847902 
2023            1281      519       31.287031  31.718452  31.549548  0.100772   31.550451