Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            274       250       14.917291  15.354968  15.116301  0.092169   15.113581 
2008            274       250       13.217613  13.841323  13.569383  0.140787   13.571936 
2009            274       250       14.433645  15.112193  14.827128  0.144037   14.825936 
2010            274       250       12.73313   13.210032  12.985256  0.108939   12.980936 
2011            274       250       12.510451  13.323129  12.947961  0.179318   12.950161 
2012            274       250       14.015774  14.636742  14.289551  0.143974   14.26858  
2013            274       250       13.585968  14.380161  14.043114  0.174722   14.046355 
2014            274       250       12.061258  12.836678  12.469491  0.171504   12.465065 
2015            274       250       13.688484  14.504709  14.143547  0.184552   14.151516 
2016            274       250       12.594516  13.23929   12.960738  0.140035   12.971436 
2017            274       250       13.376678  14.146161  13.821961  0.166034   13.82971  
2018            274       250       13.748742  14.398645  14.086306  0.144872   14.077048 
2019            274       250       15.692162  16.563194  16.237753  0.178205   16.261291 
2020            274       250       15.099838  16.71529   15.739434  0.360456   15.70971  
2021            274       250       13.743677  15.062677  14.402049  0.320777   14.438823 
2022            274       250       15.308226  15.813516  15.547533  0.120305   15.541322 
2023            274       250       15.186065  16.522161  15.778132  0.296967   15.819968