Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            919       837       27.469     28.374933  28.040905  0.164467   28.019966 
2008            919       837       29.237434  29.627634  29.447381  0.108037   29.469534 
2009            919       837       29.080133  29.578466  29.318966  0.106499   29.3606   
2010            919       837       29.979433  30.3501    30.221348  0.078694   30.216101 
2011            919       837       29.293667  29.798967  29.563691  0.131973   29.588966 
2012            919       837       28.3589    28.815533  28.678248  0.099512   28.657934 
2013            919       837       28.528866  29.029266  28.853473  0.139526   28.910067 
2014            919       837       28.789368  29.133966  28.986886  0.113682   29.008133 
2015            919       837       29.546432  29.845699  29.741885  0.057275   29.747232 
2016            919       837       29.234699  29.567533  29.393219  0.085231   29.4006   
2017            919       837       28.708967  29.071966  28.945195  0.079936   28.974199 
2018            919       837       29.505001  29.787567  29.641753  0.085086   29.641533 
2019            919       837       29.794533  30.376467  30.153897  0.134997   30.1567   
2020            919       837       29.533867  30.071899  29.946956  0.093243   29.966534 
2021            919       837       28.878599  29.4601    29.165842  0.090135   29.1581   
2022            919       837       29.339333  29.670834  29.530434  0.087905   29.549166 
2023            919       837       29.504866  30.2174    29.804035  0.174953   29.8524