Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            563       558       13.510936  14.193645  13.868816  0.181098   13.897048 
2008            563       558       13.95671   14.378967  14.18587   0.103401   14.190387 
2009            563       558       13.548129  13.719483  13.646339  0.044571   13.647952 
2010            563       558       13.477161  13.588258  13.536351  0.027916   13.536613 
2011            563       558       15.13858   15.476807  15.343407  0.088231   15.367758 
2012            563       558       14.943097  15.082548  14.988122  0.037782   14.972645 
2013            563       558       13.119258  13.330548  13.21941   0.054964   13.215597 
2014            563       558       16.612968  16.952484  16.750253  0.082189   16.736742 
2015            563       558       17.066     17.202806  17.119817  0.027177   17.114936 
2016            563       558       14.958581  15.104033  15.016812  0.04281    15.005516 
2017            563       558       13.505161  13.898807  13.691223  0.106963   13.672806 
2018            563       558       15.706839  15.987839  15.858844  0.058917   15.851677 
2019            563       558       14.182323  14.424678  14.317221  0.050075   14.31729  
2020            563       558       15.123161  15.96158   15.477485  0.224304   15.474145 
2021            563       558       14.198774  14.573968  14.352469  0.076308   14.355371 
2022            563       558       14.818742  15.062033  14.93341   0.058268   14.925436 
2023            563       558       15.813774  16.341936  15.980705  0.128204   15.935049