Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            563       558       11.088839  11.669258  11.379631  0.142956   11.39579  
2008            563       558       11.910419  12.416388  12.154873  0.132928   12.161564 
2009            563       558       12.080032  12.504193  12.309458  0.101337   12.31992  
2010            563       558       11.934065  12.167839  12.040065  0.057232   12.040694 
2011            563       558       11.890064  12.491323  12.163825  0.151122   12.154225 
2012            563       558       13.418775  13.786742  13.59544   0.09455    13.600967 
2013            563       558       12.012677  12.693065  12.35069   0.16121    12.355661 
2014            563       558       15.401516  15.697774  15.562134  0.075683   15.579322 
2015            563       558       13.575935  14.258516  13.982582  0.175317   14.02171  
2016            563       558       12.333968  12.766419  12.558289  0.117442   12.563371 
2017            563       558       13.024742  13.707613  13.375829  0.170959   13.38621  
2018            563       558       14.489064  14.975549  14.725376  0.13005    14.71279  
2019            563       558       13.157678  13.594581  13.369742  0.110065   13.368532 
2020            563       558       11.537291  11.940613  11.710706  0.104695   11.693242 
2021            563       558       12.48313   13.122581  12.788266  0.169012   12.796419 
2022            563       558       11.854807  12.502839  12.194104  0.170553   12.218161 
2023            563       558       13.646733  14.209666  13.984588  0.136752   14.0038