Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            553       489       15.042857  17.2465    16.302037  0.615315   16.390249 
2008            553       489       16.114586  17.746897  17.103889  0.466942   17.205069 
2009            553       489       14.717393  16.021572  15.501809  0.370602   15.613464 
2010            553       489       13.285357  14.747     14.060323  0.36041    14.112785 
2011            553       489       14.310429  15.955321  15.307168  0.469679   15.402322 
2012            553       489       16.448069  17.57      17.138088  0.283009   17.199966 
2013            553       489       16.037285  17.326571  16.785707  0.346602   16.831499 
2014            553       489       14.98625   16.341785  15.703498  0.347562   15.729571 
2015            553       489       14.030714  15.755214  15.073685  0.444573   15.163107 
2016            553       489       15.090655  16.084999  15.554825  0.235869   15.528207 
2017            553       489       18.181536  18.499893  18.349661  0.066875   18.353928 
2018            553       489       16.898394  18.829107  17.938893  0.510561   17.976643 
2019            553       489       16.134464  17.178249  16.654036  0.252091   16.673071 
2020            553       489       15.450034  17.119553  16.424104  0.409917   16.49869  
2021            553       489       14.467961  15.429231  14.940347  0.223267   14.918693 
2022            553       489       14.640821  15.959429  15.312246  0.290148   15.315321 
2023            553       489       17.181429  18.016001  17.657314  0.200033   17.67625