Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            435       435       7.111968   7.91029    7.402189   0.191263   7.357903  
2008            435       435       5.292065   6.351935   5.642835   0.303442   5.494258  
2009            435       435       4.036452   5.013871   4.37417    0.248155   4.290709  
2010            435       435       4.785516   5.155484   4.98505    0.071739   4.988516  
2011            435       435       2.925871   3.642839   3.194683   0.167767   3.15371   
2012            435       435       7.252903   8.222096   7.628761   0.26622    7.537419  
2013            435       435       6.046032   7.019129   6.426464   0.247548   6.380355  
2014            435       435       4.526322   5.086613   4.778772   0.128292   4.765677  
2015            435       435       4.077097   5.624064   4.59859    0.410906   4.431968  
2016            435       435       6.991452   7.916839   7.30565    0.220789   7.232548  
2017            435       435       6.010226   6.747742   6.259597   0.145832   6.224323  
2018            435       435       3.115065   4.422903   3.517664   0.312646   3.413032  
2019            435       435       4.838774   5.891032   5.230168   0.29139    5.138032  
2020            435       435       6.019936   6.858677   6.366499   0.218598   6.306355  
2021            435       435       5.585548   6.484452   5.93048    0.208721   5.88271   
2022            435       435       5.963484   6.699193   6.266905   0.160612   6.239161  
2023            435       435       6.133709   6.701613   6.396457   0.108451   6.390839