Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            733       712       18.799034  19.862301  19.258267  0.235126   19.2239   
2008            733       712       18.851267  19.538334  19.163077  0.149091   19.144601 
2009            733       712       18.501167  19.055799  18.766168  0.126714   18.756866 
2010            733       712       19.531033  20.088133  19.785709  0.120613   19.777    
2011            733       712       18.494534  19.256201  18.877171  0.174873   18.862666 
2012            733       712       17.745001  18.236166  17.96257   0.117817   17.958834 
2013            733       712       18.982433  19.627167  19.242092  0.150752   19.226417 
2014            733       712       18.104967  18.873234  18.453777  0.18254    18.446    
2015            733       712       19.649099  20.373734  19.990455  0.161433   19.975933 
2016            733       712       19.945234  20.5695    20.241387  0.149039   20.210567 
2017            733       712       18.664566  18.998899  18.80541   0.061771   18.78835  
2018            733       712       18.131634  18.596466  18.336039  0.113319   18.331767 
2019            733       712       16.451     17.339434  16.804267  0.205368   16.781883 
2020            733       712       19.739599  20.4795    20.038949  0.155059   20.011666 
2021            733       712       18.158033  18.624332  18.331939  0.097076   18.315117 
2022            733       712       18.975103  19.688622  19.320483  0.147174   19.305828 
2023            733       712       18.983299  19.499134  19.231443  0.108447   19.2153