Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            817       479       8.017968   8.418903   8.185947   0.099327   8.174065  
2008            817       479       7.813774   8.01558    7.934204   0.039283   7.936903  
2009            817       479       7.685871   8.06471    7.838695   0.095485   7.824323  
2010            817       479       9.436387   9.611065   9.518315   0.039819   9.518097  
2011            817       479       8.201871   8.602549   8.364672   0.097438   8.353129  
2012            817       479       8.139677   8.368548   8.247629   0.062169   8.240709  
2013            817       479       8.530323   9.052903   8.751841   0.131599   8.736903  
2014            817       479       8.122161   8.598097   8.335615   0.113594   8.328387  
2015            817       479       10.443645  10.968774  10.709243  0.142225   10.704516 
2016            817       479       9.464387   10.051871  9.748389   0.156352   9.733709  
2017            817       479       8.648742   9.203516   8.93274    0.150077   8.925677  
2018            817       479       9.53329    9.95258    9.744348   0.110579   9.739549  
2019            817       479       9.542678   10.047581  9.763337   0.125676   9.753516  
2020            817       479       9.194097   9.376097   9.270219   0.043417   9.265613  
2021            817       479       8.625968   9.068581   8.802749   0.109085   8.788065  
2022            817       479       8.582193   8.910065   8.722731   0.069716   8.711258  
2023            817       479       9.206967   9.474742   9.321478   0.065317   9.314613