Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1060      930       17.94842   19.212967  18.551544  0.222643   18.542419 
2008            1060      930       17.583225  19.733     18.540884  0.414707   18.541871 
2009            1060      930       16.603161  18.37184   17.391079  0.338113   17.384903 
2010            1060      930       16.805193  18.427904  17.500023  0.298944   17.482822 
2011            1060      930       16.925678  18.798967  17.747836  0.359185   17.748145 
2012            1060      930       18.223419  19.658226  18.939175  0.26067    18.960177 
2013            1060      930       17.630548  19.54187   18.530351  0.376916   18.539339 
2014            1060      930       16.78771   17.949387  17.427345  0.218277   17.455226 
2015            1060      930       18.318258  19.650549  19.073186  0.282643   19.137968 
2016            1060      930       18.520645  20.033838  19.237093  0.28444    19.244645 
2017            1060      930       16.852806  18.449451  17.720495  0.328362   17.801354 
2018            1060      930       15.582355  17.456387  16.555413  0.358622   16.619194 
2019            1060      930       16.031872  17.573322  16.965061  0.354663   17.041145 
2020            1060      930       16.476871  17.990129  17.2354    0.292515   17.252467 
2021            1060      930       19.310194  19.929033  19.511106  0.114826   19.490871 
2022            1060      930       15.799226  17.352871  16.611146  0.311344   16.695403 
2023            1060      930       15.805467  17.488367  16.613845  0.29755    16.66195