Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            890       875       19.24729   20.490419  19.979719  0.295147   19.983225 
2008            890       875       17.553871  18.866129  18.277088  0.280509   18.260452 
2009            890       875       16.880838  17.823612  17.467536  0.223041   17.505064 
2010            890       875       16.60471   17.875807  17.24754   0.276021   17.221935 
2011            890       875       17.477774  18.801033  18.176347  0.28296    18.178806 
2012            890       875       18.579     20.020903  19.234482  0.319271   19.190033 
2013            890       875       17.854517  19.153162  18.557036  0.28532    18.54171  
2014            890       875       17.228355  18.728161  18.089168  0.344538   18.129871 
2015            890       875       19.039516  20.237549  19.709505  0.289205   19.753839 
2016            890       875       18.865549  20.674742  19.790279  0.388864   19.758839 
2017            890       875       17.623161  19.572548  18.629873  0.432827   18.575096 
2018            890       875       16.383646  18.09042   17.315133  0.372561   17.302452 
2019            890       875       16.966162  18.561388  17.875991  0.361045   17.891548 
2020            890       875       16.588324  18.343967  17.596443  0.371633   17.611452 
2021            890       875       19.714193  20.934807  20.287789  0.306308   20.269194 
2022            890       875       17.782129  19.650839  18.75355   0.447441   18.733419 
2023            890       875       16.563934  19.077101  17.859324  0.546828   17.8377