Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            919       837       17.779465  18.625143  18.350243  0.192808   18.365749 
2008            919       837       20.074034  21.192896  20.708228  0.208674   20.722103 
2009            919       837       16.545107  17.499357  17.175585  0.2288     17.210392 
2010            919       837       15.739285  16.876179  16.391726  0.242251   16.386929 
2011            919       837       17.448107  18.642929  18.137957  0.176695   18.13518  
2012            919       837       19.743656  20.711275  20.307322  0.235809   20.278103 
2013            919       837       19.329857  20.412285  19.977878  0.243776   20.030071 
2014            919       837       18.905001  20.594572  19.856586  0.304477   19.864607 
2015            919       837       16.573429  17.629536  17.187783  0.221874   17.184715 
2016            919       837       17.201483  18.128241  17.882076  0.196599   17.95562  
2017            919       837       20.019501  21.016857  20.590618  0.222043   20.608999 
2018            919       837       20.324179  21.237679  20.814506  0.177999   20.818287 
2019            919       837       19.634285  20.878357  20.376937  0.279299   20.425358 
2020            919       837       19.46431   20.643448  20.173442  0.248157   20.193138 
2021            919       837       19.614346  20.931923  20.3766    0.219071   20.349962 
2022            919       837       18.029249  20.196678  19.23833   0.368673   19.23982  
2023            919       837       21.088751  22.868     22.122168  0.277453   22.135357