Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1060      930       18.699968  19.425678  19.240566  0.154461   19.290323 
2008            1060      930       17.680161  18.384935  18.067871  0.190832   18.097951 
2009            1060      930       17.978128  18.713741  18.411002  0.135977   18.450662 
2010            1060      930       15.390903  15.974838  15.842232  0.115698   15.885596 
2011            1060      930       18.704515  19.166388  18.990863  0.123756   19.006226 
2012            1060      930       19.84458   20.41713   20.274213  0.12773    20.312532 
2013            1060      930       16.672356  17.637613  17.159545  0.206391   17.197128 
2014            1060      930       16.151678  16.97242   16.598838  0.167038   16.631742 
2015            1060      930       16.851645  17.823     17.399715  0.259605   17.415468 
2016            1060      930       18.900904  19.421644  19.198252  0.087942   19.21571  
2017            1060      930       19.672483  20.487614  20.260175  0.183536   20.307258 
2018            1060      930       19.626806  20.206387  20.007904  0.120322   20.04     
2019            1060      930       17.477097  18.277807  17.951908  0.158087   17.993694 
2020            1060      930       19.730968  20.313517  20.151867  0.153484   20.222451 
2021            1060      930       16.738581  18.631098  17.674291  0.451272   17.716307 
2022            1060      930       15.66842   16.754999  16.353153  0.244589   16.394936 
2023            1060      930       20.313999  21.154129  20.778176  0.209245   20.818871