Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1073      658       21.356167  22.484333  21.929076  0.303969   21.938517 
2008            1073      658       20.928167  21.829334  21.445703  0.221193   21.472934 
2009            1073      658       20.663601  21.255066  21.072742  0.135604   21.117599 
2010            1073      658       21.1509    21.682034  21.436332  0.149031   21.458083 
2011            1073      658       20.7537    21.372566  21.024283  0.120464   21.043516 
2012            1073      658       22.206934  22.620634  22.404323  0.10581    22.408284 
2013            1073      658       20.543066  21.378166  20.92623   0.194161   20.944517 
2014            1073      658       21.753201  22.127033  21.941249  0.078441   21.943167 
2015            1073      658       22.516567  23.261833  22.942307  0.197923   22.99795  
2016            1073      658       22.612999  23.240999  22.957753  0.177685   23.012517 
2017            1073      658       21.036699  21.6646    21.373274  0.151106   21.373616 
2018            1073      658       22.825634  23.186033  23.040931  0.074165   23.052999 
2019            1073      658       21.404501  22.087233  21.809838  0.179206   21.848817 
2020            1073      658       21.850067  22.247667  22.038576  0.100501   22.040816 
2021            1073      658       21.906099  22.422066  22.14031   0.097413   22.166266 
2022            1073      658       22.5179    22.971933  22.754909  0.112633   22.7748   
2023            1073      658       21.727266  22.216034  22.049989  0.139337   22.08815