Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            560       525       18.951935  19.839001  19.430459  0.246761   19.438871 
2008            560       525       19.655903  20.731806  20.222565  0.289555   20.206451 
2009            560       525       18.271257  19.36871   18.848871  0.293545   18.813967 
2010            560       525       18.357388  19.168646  18.779575  0.221525   18.761581 
2011            560       525       18.553516  19.722387  19.163127  0.312089   19.177452 
2012            560       525       19.208612  19.994257  19.686723  0.207028   19.768129 
2013            560       525       18.586     19.680515  19.182483  0.280756   19.262323 
2014            560       525       17.587032  18.437225  18.039052  0.234939   18.031162 
2015            560       525       18.849451  19.428387  19.163537  0.145197   19.198872 
2016            560       525       19.619129  20.504677  20.104438  0.232371   20.163612 
2017            560       525       17.992033  19.226419  18.603002  0.334964   18.608517 
2018            560       525       16.571871  17.837774  17.24254   0.334206   17.30171  
2019            560       525       16.751516  17.815355  17.291168  0.280313   17.325838 
2020            560       525       17.837774  18.753193  18.302459  0.247979   18.273548 
2021            560       525       20.127001  20.678064  20.439678  0.151571   20.44458  
2022            560       525       16.681549  17.734161  17.206078  0.28471    17.224743 
2023            560       525       17.306499  18.5851    18.003155  0.298202   17.9373