Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1060      930       30.28142   30.785     30.535775  0.112313   30.545371 
2008            1060      930       28.572226  29.387838  29.184269  0.159728   29.25079  
2009            1060      930       29.881645  30.481678  30.300283  0.143235   30.348274 
2010            1060      930       30.690968  31.04458   30.881613  0.074131   30.877081 
2011            1060      930       30.402     30.934032  30.79194   0.109807   30.833452 
2012            1060      930       30.00658   30.419613  30.255521  0.077365   30.263597 
2013            1060      930       29.469225  29.924162  29.772707  0.092907   29.784726 
2014            1060      930       29.405613  29.992388  29.822992  0.110402   29.825467 
2015            1060      930       29.817354  30.469999  30.240981  0.134874   30.241725 
2016            1060      930       30.007     30.336193  30.157015  0.066087   30.14821  
2017            1060      930       30.11471   30.342548  30.23228   0.059221   30.227339 
2018            1060      930       29.468451  29.92758   29.76771   0.087156   29.782952 
2019            1060      930       30.280258  30.608999  30.451036  0.060625   30.440838 
2020            1060      930       30.233709  30.58671   30.404767  0.067918   30.411161 
2021            1060      930       30.422806  30.864775  30.67499   0.100239   30.696838 
2022            1060      930       30.050194  30.432354  30.134276  0.069332   30.113597 
2023            1060      930       29.697805  31.131678  30.656887  0.286634   30.710774