Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            309       273       14.862839  15.690968  15.383447  0.170347   15.403613 
2008            309       273       16.54813   17.176451  16.989511  0.130881   17.013807 
2009            309       273       13.833097  14.669129  14.403037  0.155525   14.416097 
2010            309       273       15.683258  16.82958   16.476487  0.220922   16.505548 
2011            309       273       15.500936  16.725903  16.298371  0.244117   16.31229  
2012            309       273       16.112162  17.517807  17.105892  0.274632   17.142485 
2013            309       273       15.726645  16.976032  16.64866   0.245947   16.695032 
2014            309       273       14.860323  16.198162  15.774629  0.269693   15.793839 
2015            309       273       14.07142   15.026774  14.738897  0.192663   14.756387 
2016            309       273       15.189871  16.604452  16.19349   0.279081   16.240484 
2017            309       273       14.564129  15.938129  15.563185  0.268744   15.598129 
2018            309       273       14.915483  16.433258  15.97518   0.311697   16.006516 
2019            309       273       15.163903  16.425386  15.941516  0.249435   15.96542  
2020            309       273       15.425033  16.851774  16.366531  0.288732   16.387096 
2021            309       273       15.604548  16.127419  15.899606  0.143519   15.911903 
2022            309       273       15.731742  16.972225  16.663919  0.261175   16.709484 
2023            309       273       18.125872  19.214033  18.835245  0.194029   18.847452