Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            158       154       16.648571  17.411142  17.036486  0.193944   17.033661 
2008            158       154       17.322275  17.740965  17.544506  0.100568   17.549775 
2009            158       154       15.821178  16.258928  16.031255  0.110362   16.027196 
2010            158       154       14.631464  15.052893  14.833693  0.107472   14.835393 
2011            158       154       15.414965  15.893357  15.644159  0.119382   15.634875 
2012            158       154       17.21369   17.792656  17.493501  0.147257   17.490672 
2013            158       154       17.091822  17.656107  17.332004  0.147357   17.321358 
2014            158       154       15.977536  16.532465  16.250331  0.13987    16.24334  
2015            158       154       15.409322  16.007463  15.684691  0.153019   15.680768 
2016            158       154       15.690276  16.367897  16.009202  0.172318   16.00531  
2017            158       154       18.391821  18.627144  18.507743  0.063519   18.505232 
2018            158       154       18.420393  18.95225   18.668608  0.131492   18.637964 
2019            158       154       16.994179  17.373285  17.189713  0.097487   17.19416  
2020            158       154       16.631241  17.328138  16.947876  0.17555    16.933086 
2021            158       154       15.135846  15.799692  15.42186   0.166473   15.411    
2022            158       154       15.090322  16.009321  15.516976  0.233205   15.509018 
2023            158       154       17.687963  18.315607  17.963823  0.159787   17.949983