Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            559       485       16.383322  18.104258  17.1153    0.354314   17.116419 
2008            559       485       16.675194  17.354517  16.904805  0.135626   16.89587  
2009            559       485       17.588354  18.042871  17.772896  0.100987   17.761227 
2010            559       485       18.085451  18.748774  18.36708   0.144011   18.358839 
2011            559       485       18.238646  19.384903  18.654557  0.290342   18.582226 
2012            559       485       18.767904  19.384386  19.030898  0.127516   19.018194 
2013            559       485       16.57613   17.151613  16.808055  0.11712    16.806677 
2014            559       485       18.490194  19.85013   19.081292  0.30253    19.089968 
2015            559       485       17.988516  18.796871  18.387741  0.187003   18.409548 
2016            559       485       16.945162  17.812323  17.396441  0.201133   17.408516 
2017            559       485       17.843355  19.378967  18.435289  0.365303   18.419678 
2018            559       485       18.823904  19.444613  19.107882  0.150054   19.092419 
2019            559       485       19.714743  20.431227  20.014593  0.165503   19.98984  
2020            559       485       16.51713   17.475     16.974528  0.226013   16.976839 
2021            559       485       17.833775  18.562935  18.116444  0.175092   18.078386 
2022            559       485       17.813839  18.439936  18.078124  0.144949   18.061129 
2023            559       485       17.508226  18.243065  17.800742  0.169823   17.769194