Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            435       435       18.389904  19.076677  18.892907  0.14347    18.957483 
2008            435       435       16.859806  17.23      16.997602  0.093682   16.985291 
2009            435       435       16.289774  16.551001  16.431465  0.045134   16.430258 
2010            435       435       17.048258  17.398291  17.287974  0.062146   17.300354 
2011            435       435       17.291677  17.698387  17.548792  0.079208   17.562742 
2012            435       435       17.490774  17.783484  17.623558  0.067225   17.623096 
2013            435       435       17.394838  17.789549  17.601685  0.063626   17.593098 
2014            435       435       17.739485  18.122614  17.835162  0.108538   17.783354 
2015            435       435       17.164677  17.465097  17.347666  0.04983    17.357193 
2016            435       435       17.667839  18.276419  18.002681  0.135815   18.01687  
2017            435       435       18.673355  19.08042   18.946828  0.069578   18.956839 
2018            435       435       18.249161  18.63271   18.521894  0.06502    18.532999 
2019            435       435       17.72958   18.048485  17.886563  0.087228   17.900936 
2020            435       435       17.328968  17.963646  17.754349  0.158871   17.81229  
2021            435       435       19.17658   19.384031  19.285546  0.032906   19.284355 
2022            435       435       17.05913   17.542257  17.240077  0.124635   17.203871 
2023            435       435       17.123936  17.633289  17.47826   0.11115    17.514677