Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            559       485       21.882668  22.639133  22.218516  0.161457   22.230333 
2008            559       485       23.634834  24.692533  24.200745  0.251352   24.241133 
2009            559       485       23.579399  24.213833  23.872147  0.157097   23.858734 
2010            559       485       24.481766  24.901333  24.675014  0.08961    24.662666 
2011            559       485       23.750601  24.422899  24.008506  0.12665    23.996    
2012            559       485       22.871067  23.788467  23.238273  0.1975     23.253834 
2013            559       485       21.515167  22.9119    22.02287   0.345036   21.954433 
2014            559       485       23.585234  24.111099  23.895316  0.112529   23.8988   
2015            559       485       23.139933  24.2027    23.615611  0.241723   23.604467 
2016            559       485       22.620766  23.541166  23.068066  0.175303   23.0784   
2017            559       485       22.380234  23.013332  22.669548  0.14813    22.655201 
2018            559       485       24.728701  25.5093    25.086373  0.173737   25.085833 
2019            559       485       23.397034  23.9415    23.666516  0.133362   23.660866 
2020            559       485       21.904301  22.599133  22.229476  0.161144   22.221634 
2021            559       485       22.542866  23.2729    22.829581  0.161645   22.806601 
2022            559       485       23.334766  24.2342    23.683319  0.180168   23.673834 
2023            559       485       21.159733  21.959232  21.537545  0.180456   21.5203