Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            817       479       8.582      8.840516   8.675221   0.049378   8.662613  
2008            817       479       7.991323   8.095194   8.038221   0.022822   8.041355  
2009            817       479       7.924807   8.22       8.089714   0.053802   8.090968  
2010            817       479       9.850549   10.048225  9.95935    0.047029   9.968194  
2011            817       479       8.232032   8.530322   8.37089    0.075679   8.369064  
2012            817       479       7.578129   7.738839   7.65305    0.038608   7.652258  
2013            817       479       8.274258   8.38171    8.304745   0.025115   8.296741  
2014            817       479       9.743581   10.007646  9.923912   0.050112   9.931161  
2015            817       479       11.194484  11.484968  11.305713  0.067218   11.292935 
2016            817       479       10.519258  10.822258  10.669312  0.057446   10.669226 
2017            817       479       9.16958    9.36871    9.250635   0.043468   9.247323  
2018            817       479       8.183129   8.463645   8.306082   0.061602   8.306226  
2019            817       479       8.532548   8.811903   8.640089   0.066827   8.629129  
2020            817       479       7.848678   8.314484   8.09287    0.129396   8.081742  
2021            817       479       7.140968   8.060387   7.408228   0.268874   7.283355  
2022            817       479       8.119193   8.339387   8.18641    0.066784   8.149096  
2023            817       479       7.009419   7.515355   7.207337   0.139235   7.174645