Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            890       875       19.464483  19.845291  19.684853  0.079898   19.686678 
2008            890       875       18.305     18.869677  18.580397  0.156783   18.614775 
2009            890       875       19.812033  20.296774  20.113372  0.109383   20.132904 
2010            890       875       15.765645  16.431644  16.070581  0.147408   16.05271  
2011            890       875       20.464161  20.88187   20.667868  0.099022   20.68716  
2012            890       875       21.554483  21.898291  21.690229  0.081561   21.668484 
2013            890       875       17.157774  18.099161  17.623062  0.239642   17.658194 
2014            890       875       16.949322  17.786936  17.410581  0.188769   17.401419 
2015            890       875       19.233419  20.087     19.75653   0.2065     19.743258 
2016            890       875       19.325548  19.643162  19.425794  0.073209   19.407064 
2017            890       875       20.318001  20.802485  20.604861  0.100016   20.616419 
2018            890       875       19.786097  20.598322  20.218402  0.196701   20.218678 
2019            890       875       17.278065  18.255259  17.874498  0.209166   17.897032 
2020            890       875       20.790096  21.345903  21.11898   0.125935   21.156612 
2021            890       875       19.073162  19.822935  19.504228  0.156441   19.519581 
2022            890       875       18.516968  19.519064  19.08078   0.263594   19.106678 
2023            890       875       21.602419  21.869419  21.715274  0.06751    21.690096