Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            559       485       15.341933  16.460333  16.001785  0.279129   16.0618   
2008            559       485       13.648867  14.8032    14.222426  0.290848   14.213167 
2009            559       485       15.161034  16.048933  15.608108  0.204168   15.600367 
2010            559       485       14.246367  14.818533  14.549945  0.149008   14.558    
2011            559       485       14.4774    15.5151    15.004519  0.291197   14.994    
2012            559       485       12.837733  14.013866  13.4856    0.310152   13.508433 
2013            559       485       14.5325    15.6395    15.103401  0.294903   15.108233 
2014            559       485       14.000033  15.1196    14.625943  0.290081   14.655434 
2015            559       485       16.313267  17.115034  16.747829  0.227283   16.748934 
2016            559       485       14.858933  15.490933  15.19388   0.143781   15.201834 
2017            559       485       15.655633  16.451633  16.063304  0.171848   16.069099 
2018            559       485       14.6316    15.606767  15.135387  0.224909   15.158566 
2019            559       485       14.577933  15.4818    15.097168  0.204805   15.129434 
2020            559       485       16.866367  17.551933  17.274069  0.172267   17.309799 
2021            559       485       14.627733  15.6333    15.145389  0.245955   15.155933 
2022            559       485       15.848759  16.848482  16.400402  0.289627   16.424896 
2023            559       485       15.091866  15.631033  15.379705  0.120103   15.396767