Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            817       479       13.207267  13.353733  13.303428  0.03551    13.3086   
2008            817       479       12.551267  12.940534  12.819011  0.103466   12.864834 
2009            817       479       13.8837    14.577633  14.393487  0.173601   14.438566 
2010            817       479       13.686367  13.944867  13.875822  0.050375   13.885767 
2011            817       479       14.052     14.3337    14.279691  0.05718    14.299867 
2012            817       479       14.2373    14.4708    14.410525  0.055823   14.441401 
2013            817       479       14.9746    15.125934  15.090672  0.033306   15.1002   
2014            817       479       13.494333  14.2709    13.961011  0.193077   13.964767 
2015            817       479       11.8409    13.169233  12.487893  0.314661   12.4503   
2016            817       479       13.599167  14.555767  14.111495  0.230984   14.0945   
2017            817       479       14.116867  14.857933  14.63695   0.186524   14.669033 
2018            817       479       14.534534  15.130234  14.976111  0.14314    15.038267 
2019            817       479       12.9702    14.065166  13.573159  0.264622   13.5582   
2020            817       479       15.601033  16.2488    15.998471  0.177271   16.0557   
2021            817       479       16.405933  17.895201  17.369726  0.3993     17.500267 
2022            817       479       14.183233  14.303467  14.271495  0.029013   14.282166 
2023            817       479       14.099367  14.9092    14.638925  0.208606   14.7108