Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            435       435       16.477633  18.366301  17.393884  0.52268    17.300367 
2008            435       435       17.640633  18.710167  18.184883  0.307614   18.163067 
2009            435       435       15.6469    17.441866  16.464877  0.44867    16.402401 
2010            435       435       18.002567  19.235901  18.505765  0.280319   18.466566 
2011            435       435       17.955366  19.508867  18.931002  0.325417   18.941467 
2012            435       435       18.282299  19.947866  19.19946   0.35348    19.1681   
2013            435       435       17.012066  17.922333  17.710605  0.19693    17.771601 
2014            435       435       17.032299  18.584499  17.83891   0.425645   17.7833   
2015            435       435       16.504499  18.014034  17.263931  0.387483   17.2623   
2016            435       435       17.215334  18.4774    17.784064  0.296818   17.729767 
2017            435       435       16.568001  18.359533  17.602757  0.448031   17.606001 
2018            435       435       16.645666  18.125267  17.48072   0.358985   17.521566 
2019            435       435       17.172699  18.625534  18.126054  0.352504   18.181133 
2020            435       435       17.310133  18.6038    18.065661  0.334394   18.117268 
2021            435       435       17.708933  18.640467  18.329399  0.164013   18.397066 
2022            435       435       18.156366  19.219366  18.721185  0.302445   18.698633 
2023            435       435       17.260067  18.621099  17.948078  0.329434   17.941467