Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            256       223       15.424643  16.255928  15.981818  0.175262   16.028322 
2008            256       223       16.558897  17.385689  17.054558  0.137374   17.052965 
2009            256       223       15.403071  16.21843   15.884046  0.163129   15.891857 
2010            256       223       13.989607  14.85325   14.539515  0.14859    14.550285 
2011            256       223       14.34875   15.111107  14.866576  0.159745   14.912143 
2012            256       223       16.523794  17.251242  16.965032  0.124504   16.968241 
2013            256       223       16.595215  17.306213  17.051135  0.131891   17.059393 
2014            256       223       15.118857  15.9545    15.646767  0.16646    15.66775  
2015            256       223       14.754464  15.7155    15.360036  0.176602   15.35725  
2016            256       223       15.023586  16.082241  15.672841  0.205947   15.66469  
2017            256       223       18.122572  18.769072  18.50752   0.125716   18.505714 
2018            256       223       17.602142  18.425894  18.133443  0.144728   18.137821 
2019            256       223       16.342501  17.145     16.874588  0.143414   16.8815   
2020            256       223       15.462379  16.606932  16.193036  0.231027   16.241276 
2021            256       223       14.192462  15.443423  14.983388  0.235027   15.001231 
2022            256       223       13.893785  15.481679  14.885964  0.291516   14.885607 
2023            256       223       17.046249  18.036678  17.727578  0.180914   17.743214