Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            817       479       16.73284   16.968548  16.895996  0.043358   16.911259 
2008            817       479       12.180451  13.28258   12.774318  0.262431   12.758194 
2009            817       479       12.557194  13.831549  13.29583   0.314911   13.282645 
2010            817       479       13.061548  13.705129  13.507483  0.143193   13.535161 
2011            817       479       14.32229   15.210839  14.840039  0.223475   14.843323 
2012            817       479       15.720451  16.021     15.940092  0.069224   15.958612 
2013            817       479       13.682549  14.659839  14.231648  0.242209   14.227033 
2014            817       479       14.51158   15.992774  15.390561  0.360531   15.393387 
2015            817       479       15.449806  16.50758   16.076441  0.261713   16.074162 
2016            817       479       14.301226  15.399838  14.951646  0.280925   14.949451 
2017            817       479       13.413194  15.057581  14.301921  0.395461   14.276838 
2018            817       479       13.407323  14.921678  14.264839  0.351411   14.250258 
2019            817       479       16.139839  17.06671   16.741177  0.235878   16.751451 
2020            817       479       16.998516  18.660645  18.073534  0.46767    18.241613 
2021            817       479       18.266806  20.259451  19.51866   0.569822   19.69142  
2022            817       479       14.833549  15.798225  15.448693  0.198666   15.471968 
2023            817       479       16.19742   16.876354  16.691715  0.089231   16.694098