Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1073      658       18.89558   19.437128  19.209196  0.147315   19.23829  
2008            1073      658       16.696096  16.988613  16.768551  0.043917   16.765097 
2009            1073      658       16.23329   16.398193  16.263708  0.033736   16.25     
2010            1073      658       16.819515  17.321259  16.983386  0.092996   16.993806 
2011            1073      658       17.101871  17.657709  17.171477  0.085468   17.145758 
2012            1073      658       17.522354  17.805935  17.581333  0.04239    17.576902 
2013            1073      658       17.457516  17.793354  17.592256  0.059731   17.587257 
2014            1073      658       17.456903  17.845613  17.538016  0.075572   17.510565 
2015            1073      658       16.738031  17.289709  16.970236  0.149751   16.965485 
2016            1073      658       17.970646  18.266031  18.067243  0.063586   18.05542  
2017            1073      658       18.781485  19.332291  18.97317   0.086383   18.972662 
2018            1073      658       18.397968  18.992258  18.616302  0.113526   18.615694 
2019            1073      658       17.688032  17.874001  17.719313  0.027633   17.710194 
2020            1073      658       17.17713   17.561193  17.227742  0.052236   17.214193 
2021            1073      658       18.557064  19.328581  18.859191  0.14909    18.851613 
2022            1073      658       16.349291  16.994387  16.531773  0.160703   16.484    
2023            1073      658       17.162001  17.585096  17.362664  0.092376   17.356096