Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            817       479       8.071821   8.171822   8.125978   0.018354   8.127214  
2008            817       479       7.776138   7.982034   7.89628    0.050437   7.898483  
2009            817       479       7.174572   7.416965   7.287096   0.048917   7.2795    
2010            817       479       9.828608   10.043143  9.933411   0.051352   9.933321  
2011            817       479       7.749321   8.150607   7.948768   0.109478   7.943714  
2012            817       479       8.028034   8.335241   8.166845   0.07515    8.165414  
2013            817       479       8.13125    8.385678   8.255392   0.06328    8.252464  
2014            817       479       8.066428   8.328321   8.196313   0.051181   8.191821  
2015            817       479       10.947429  11.227393  11.066299  0.064291   11.060572 
2016            817       479       10.191034  10.490793  10.335079  0.074918   10.334311 
2017            817       479       8.490321   9.084964   8.76785    0.156758   8.756321  
2018            817       479       8.366035   8.681607   8.497444   0.070715   8.493178  
2019            817       479       8.146857   8.636214   8.377367   0.123856   8.377393  
2020            817       479       8.318896   8.695518   8.488156   0.091725   8.487862  
2021            817       479       7.674808   7.977      7.813575   0.056504   7.817846  
2022            817       479       6.859428   7.682964   7.223592   0.22967    7.188035  
2023            817       479       7.876857   8.025928   7.943855   0.028436   7.942107