Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            2271      1991      14.729065  16.693516  15.693859  0.520439   15.664064 
2008            2271      1991      14.285161  16.707323  15.393867  0.670283   15.29342  
2009            2271      1991      15.009903  16.334419  15.838231  0.322453   15.899775 
2010            2271      1991      14.678645  17.500904  15.795772  0.722099   15.635936 
2011            2271      1991      15.695419  17.161774  16.459447  0.370629   16.468323 
2012            2271      1991      16.345903  18.300678  17.134252  0.487912   17.064129 
2013            2271      1991      14.354065  17.828356  15.665779  0.887472   15.490613 
2014            2271      1991      14.417548  16.568645  15.429401  0.568832   15.408968 
2015            2271      1991      15.192     17.718807  16.312716  0.670495   16.235548 
2016            2271      1991      13.948839  16.24229   14.947022  0.553516   14.864774 
2017            2271      1991      14.644161  16.691225  15.508611  0.518455   15.444225 
2018            2271      1991      15.65642   17.110161  16.44949   0.381381   16.479677 
2019            2271      1991      15.577903  17.002903  16.434609  0.316411   16.483484 
2020            2271      1991      13.516258  15.401871  14.463751  0.457102   14.422258 
2021            2271      1991      15.316129  18.248356  16.690095  0.737133   16.574322 
2022            2271      1991      14.38542   15.791     15.14494   0.365609   15.150742 
2023            2271      1991      15.861032  17.767645  16.934441  0.493281   16.948225