Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            563       558       11.816871  12.408     12.133051  0.137744   12.151564 
2008            563       558       11.126225  11.641419  11.415521  0.150174   11.453726 
2009            563       558       11.75042   11.875774  11.823051  0.02788    11.827774 
2010            563       558       13.012065  13.22171   13.158921  0.044531   13.174677 
2011            563       558       11.979838  12.12129   12.0626    0.031481   12.061419 
2012            563       558       10.753033  10.960968  10.90992   0.052592   10.932258 
2013            563       558       11.413322  11.520967  11.457607  0.035045   11.453855 
2014            563       558       13.093774  13.405548  13.206186  0.080885   13.194549 
2015            563       558       13.700291  14.207419  13.92547   0.124953   13.912758 
2016            563       558       13.597451  13.828548  13.755177  0.042691   13.767404 
2017            563       558       12.812968  13.089226  13.010699  0.045726   13.019903 
2018            563       558       12.090903  12.343839  12.243889  0.051174   12.231952 
2019            563       558       13.054839  13.227839  13.135934  0.047459   13.116807 
2020            563       558       12.85371   13.163516  13.022274  0.068915   13.013823 
2021            563       558       10.83329   11.253613  11.05677   0.105497   11.078259 
2022            563       558       11.346709  11.827387  11.643111  0.126281   11.666049 
2023            563       558       11.160419  11.457484  11.342965  0.07089    11.342355