Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            598       598       15.703867  16.646667  16.160611  0.197742   16.17185  
2008            598       598       16.683067  17.919767  17.302463  0.306218   17.333384 
2009            598       598       14.718066  15.765467  15.294449  0.232281   15.337717 
2010            598       598       17.502199  18.238966  17.976717  0.165071   18.036483 
2011            598       598       16.501368  18.015133  17.138903  0.373359   17.080783 
2012            598       598       17.232933  18.471434  17.816886  0.261808   17.846267 
2013            598       598       16.222401  17.1467    16.586827  0.205984   16.572001 
2014            598       598       15.897333  17.146534  16.4424    0.289423   16.422684 
2015            598       598       15.8301    16.459801  16.159935  0.138256   16.174867 
2016            598       598       16.315268  17.550133  16.948564  0.307844   17.003683 
2017            598       598       15.800866  16.883766  16.232085  0.262885   16.163834 
2018            598       598       16.0431    16.7551    16.533813  0.149531   16.5878   
2019            598       598       16.225367  17.268734  16.88864   0.238598   16.994316 
2020            598       598       16.3195    17.562366  16.816106  0.279279   16.740817 
2021            598       598       16.443634  17.7756    17.049375  0.315458   17.002333 
2022            598       598       17.546499  18.383368  18.168924  0.214113   18.258417 
2023            598       598       16.667633  17.4244    17.100055  0.159405   17.140533