Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            495       426       17.269806  17.858517  17.69753   0.129344   17.721871 
2008            495       426       16.574354  17.622644  17.186095  0.251973   17.168565 
2009            495       426       18.350485  18.867451  18.731506  0.113745   18.762161 
2010            495       426       15.375355  16.370323  15.969512  0.228267   15.968855 
2011            495       426       18.088354  18.792387  18.486592  0.143146   18.507742 
2012            495       426       19.147646  19.772806  19.621667  0.138571   19.668678 
2013            495       426       16.145388  17.464516  16.850007  0.340698   16.816612 
2014            495       426       15.425806  16.443483  16.107094  0.232333   16.146275 
2015            495       426       17.808935  18.748484  18.419463  0.201678   18.456161 
2016            495       426       18.155548  18.850677  18.502915  0.137507   18.48984  
2017            495       426       18.536936  19.329548  19.028341  0.178471   19.040177 
2018            495       426       18.44142   19.532419  19.096785  0.247305   19.099952 
2019            495       426       17.00671   17.991259  17.640057  0.233469   17.655548 
2020            495       426       20.099516  20.710838  20.550313  0.126856   20.578259 
2021            495       426       17.671484  18.308807  18.069568  0.146358   18.080016 
2022            495       426       17.072645  18.331354  17.817332  0.2723     17.840742 
2023            495       426       20.098194  20.524097  20.389749  0.098531   20.405678