Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            86        13        20.500011  20.686958  20.595035  0.056669   20.599274 
2008            86        13        19.524929  19.755199  19.641182  0.06903    19.65032  
2009            86        13        19.213512  19.519966  19.366297  0.089696   19.391737 
2010            86        13        18.880329  19.150339  19.015954  0.07955    19.033951 
2011            86        13        18.86842   19.148787  19.009723  0.082448   19.031775 
2012            86        13        20.037544  20.286074  20.162515  0.073337   20.17981  
2013            86        13        18.889288  19.164732  19.028375  0.081973   19.043728 
2014            86        13        18.880844  19.171305  19.027001  0.08624    19.043224 
2015            86        13        19.691742  20.001934  19.847146  0.090588   19.873127 
2016            86        13        19.738268  20.017595  19.877666  0.083176   19.8902   
2017            86        13        19.767628  20.035192  19.902709  0.080404   19.912567 
2018            86        13        19.38998   19.695135  19.543698  0.091594   19.553986 
2019            86        13        19.866695  20.116123  19.992338  0.074344   20.004118 
2020            86        13        19.708527  19.969971  19.839619  0.079676   19.841593 
2021            86        13        19.487911  19.748964  19.617642  0.078256   19.624006 
2022            86        13        19.559319  19.851206  19.707169  0.087333   19.719805 
2023            86        13        19.509226  19.77722   19.644653  0.082563   19.643776