Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            710       666       16.003355  16.257387  16.128993  0.055362   16.121677 
2008            710       666       17.316225  18.02758   17.669336  0.228448   17.691306 
2009            710       666       15.069516  15.643484  15.376623  0.102897   15.381064 
2010            710       666       17.536613  18.251129  17.961531  0.12565    17.979951 
2011            710       666       17.199614  17.759129  17.563596  0.115838   17.574661 
2012            710       666       17.818935  18.463709  18.189719  0.15425    18.197435 
2013            710       666       17.273775  18.380806  17.861693  0.234863   17.870355 
2014            710       666       16.069613  16.824451  16.459834  0.189229   16.456355 
2015            710       666       15.489     16.477741  16.012919  0.196946   16.011371 
2016            710       666       16.696678  17.289322  17.024811  0.118703   17.013758 
2017            710       666       16.078709  16.750549  16.46324   0.14078    16.459516 
2018            710       666       16.342838  17.277161  16.847824  0.195519   16.852951 
2019            710       666       17.366516  18.212452  17.841005  0.173943   17.823113 
2020            710       666       17.463387  18.367678  18.018521  0.191114   18.051855 
2021            710       666       16.613291  17.009226  16.808532  0.070813   16.802291 
2022            710       666       16.835871  17.380968  17.03264   0.146898   16.987645 
2023            710       666       19.004129  19.722387  19.295874  0.210723   19.271839