Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            207       197       18.934517  19.314032  19.167034  0.081357   19.166323 
2008            207       197       18.115644  18.694387  18.466583  0.130387   18.486774 
2009            207       197       19.347355  19.91      19.675287  0.128745   19.687    
2010            207       197       15.975     16.563227  16.333472  0.128449   16.331936 
2011            207       197       17.708677  18.296709  18.041327  0.147979   18.069    
2012            207       197       16.506258  17.61042   17.113889  0.276852   17.158161 
2013            207       197       18.263     18.79229   18.574541  0.120244   18.593742 
2014            207       197       15.434871  17.046354  16.301182  0.390946   16.324839 
2015            207       197       18.446711  18.908838  18.7279    0.100421   18.728001 
2016            207       197       15.661871  16.600515  16.184117  0.23027    16.215677 
2017            207       197       16.573742  17.695     17.159469  0.277415   17.187258 
2018            207       197       14.883032  15.948838  15.491643  0.261996   15.531838 
2019            207       197       15.653258  16.409388  16.093699  0.174277   16.099613 
2020            207       197       16.784225  17.538033  17.209671  0.178428   17.228161 
2021            207       197       15.534258  16.582903  16.136822  0.233326   16.137646 
2022            207       197       18.566742  19.494484  19.107451  0.203027   19.102291 
2023            207       197       15.296258  16.349001  15.91506   0.254907   15.956613