Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            6786      5027      13.560067  14.800533  14.228991  0.262453   14.254367 
2008            6786      5027      11.823667  13.018633  12.238868  0.22635    12.175067 
2009            6786      5027      13.382433  14.723733  14.009053  0.30348    14.001567 
2010            6786      5027      12.666833  13.8446    13.275247  0.270352   13.286034 
2011            6786      5027      12.940733  14.1089    13.411418  0.233163   13.4018   
2012            6786      5027      11.104267  12.2333    11.56213   0.189665   11.535233 
2013            6786      5027      12.313766  13.9665    12.854657  0.340068   12.720433 
2014            6786      5027      11.483767  13.445133  12.307064  0.332744   12.2589   
2015            6786      5027      14.412766  15.902333  15.120585  0.304155   15.1141   
2016            6786      5027      13.626634  14.9758    14.230354  0.310163   14.289166 
2017            6786      5027      13.823334  15.3752    14.456258  0.30006    14.427466 
2018            6786      5027      12.553233  14.339     13.314691  0.366597   13.2647   
2019            6786      5027      12.9448    14.273     13.534622  0.266092   13.517967 
2020            6786      5027      14.902966  16.3538    15.48949   0.324255   15.412133 
2021            6786      5027      13.107467  14.292334  13.744768  0.266664   13.802934 
2022            6786      5027      13.997518  15.522103  14.669689  0.347205   14.633931 
2023            6786      5027      13.5044    14.893434  14.368344  0.288988   14.463767