Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1320      1260      19.58271   20.256935  19.980539  0.162297   20.002257 
2008            1320      1260      20.080452  20.626032  20.349779  0.113581   20.336033 
2009            1320      1260      20.851742  21.822645  21.342543  0.189168   21.374274 
2010            1320      1260      19.506548  20.986677  20.219411  0.295686   20.255097 
2011            1320      1260      20.116032  21.076548  20.528891  0.180248   20.517532 
2012            1320      1260      21.325935  22.385742  21.761961  0.188028   21.762968 
2013            1320      1260      20.389097  21.583807  21.025835  0.207475   21.052177 
2014            1320      1260      19.473387  20.428741  19.914221  0.19893    19.908774 
2015            1320      1260      20.719612  22.099258  21.48867   0.269114   21.492968 
2016            1320      1260      21.290161  22.238258  21.702224  0.162691   21.733435 
2017            1320      1260      19.790773  20.930935  20.420472  0.230374   20.476838 
2018            1320      1260      21.072742  22.018227  21.373643  0.221263   21.279677 
2019            1320      1260      20.743     21.577419  21.112909  0.136106   21.122065 
2020            1320      1260      21.009418  22.192322  21.501227  0.259863   21.484549 
2021            1320      1260      21.368517  22.741581  22.030106  0.285995   22.027274 
2022            1320      1260      20.148806  21.545967  20.735133  0.309795   20.717451 
2023            1320      1260      19.186291  20.317387  19.61364   0.227478   19.566241