Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            435       393       8.669903   9.17029    8.958012   0.139766   8.973354  
2008            435       393       8.001967   8.112871   8.064348   0.027105   8.063291  
2009            435       393       7.733774   7.877742   7.795639   0.037937   7.793903  
2010            435       393       9.729129   9.929968   9.83141    0.043094   9.832     
2011            435       393       8.065774   8.277742   8.159913   0.043832   8.15629   
2012            435       393       7.449548   7.587839   7.537102   0.031396   7.546387  
2013            435       393       8.343549   8.437323   8.390772   0.029348   8.391807  
2014            435       393       9.609742   9.757871   9.672688   0.038093   9.675871  
2015            435       393       11.05229   11.289032  11.218589  0.051974   11.227677 
2016            435       393       10.246806  10.452032  10.364225  0.050323   10.36971  
2017            435       393       8.900645   9.111838   8.993585   0.050125   8.986194  
2018            435       393       8.238484   8.403      8.342629   0.034674   8.34571   
2019            435       393       8.376516   8.602387   8.43475    0.045948   8.420226  
2020            435       393       8.203161   8.435742   8.328411   0.059299   8.339161  
2021            435       393       7.757097   8.231742   8.020787   0.08685    8.017775  
2022            435       393       8.290483   8.532678   8.443108   0.059092   8.455645  
2023            435       393       7.227645   7.631258   7.421374   0.102629   7.40671