Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            6786      5027      8.248      10.778065  9.461132   0.606526   9.454613  
2008            6786      5027      6.883968   9.253967   7.833852   0.546616   7.780903  
2009            6786      5027      8.083323   9.928064   8.814289   0.414387   8.743484  
2010            6786      5027      5.349516   7.226903   6.139816   0.37593    6.094613  
2011            6786      5027      9.490387   11.199516  10.08637   0.369142   10.006419 
2012            6786      5027      8.524387   9.887      8.998124   0.313169   8.916581  
2013            6786      5027      6.670032   9.487323   7.566622   0.596865   7.436484  
2014            6786      5027      7.241838   8.90771    7.862421   0.348696   7.813355  
2015            6786      5027      11.264742  13.171678  12.066178  0.433368   11.998581 
2016            6786      5027      8.119323   9.948484   8.795548   0.400947   8.686646  
2017            6786      5027      8.287065   10.262096  8.925755   0.427405   8.802484  
2018            6786      5027      6.931516   8.623806   7.576121   0.352314   7.498839  
2019            6786      5027      7.553839   9.471419   8.243992   0.426076   8.133645  
2020            6786      5027      8.811839   10.656936  9.548921   0.350008   9.472775  
2021            6786      5027      8.532968   10.572645  9.436892   0.422603   9.369904  
2022            6786      5027      7.957581   9.828516   8.768187   0.442083   8.73758   
2023            6786      5027      8.159467   9.8933     9.062035   0.374625   9.056