Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            590       553       26.642332  26.842316  26.745128  0.04411    26.745478 
2008            590       553       26.311079  26.545204  26.422645  0.047018   26.418833 
2009            590       553       26.699211  26.942638  26.838778  0.065707   26.84811  
2010            590       553       26.209513  26.470758  26.352693  0.058791   26.353933 
2011            590       553       26.757275  26.93692   26.846467  0.038154   26.845366 
2012            590       553       26.661377  26.874578  26.769445  0.048499   26.764507 
2013            590       553       26.593466  26.851707  26.722583  0.062819   26.719873 
2014            590       553       26.900106  27.102112  26.998692  0.045708   27.000071 
2015            590       553       27.293533  27.476835  27.381425  0.043114   27.377403 
2016            590       553       27.16888   27.420027  27.302478  0.054642   27.295197 
2017            590       553       27.012537  27.247641  27.139211  0.049436   27.133581 
2018            590       553       26.985521  27.223156  27.101371  0.055815   27.095329 
2019            590       553       27.253929  27.480179  27.363385  0.049927   27.36014  
2020            590       553       27.421667  27.63118   27.5539    0.044031   27.559271 
2021            590       553       26.877981  27.051678  26.970966  0.043013   26.971516 
2022            590       553       27.367264  27.521898  27.441863  0.038634   27.438231 
2023            590       553       27.439445  27.71406   27.576298  0.069334   27.569529