Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            310       302       19.83758   20.10387   19.952758  0.068314   19.945274 
2008            310       302       20.710484  21.067614  20.891368  0.085791   20.88179  
2009            310       302       19.451872  20.187485  19.786594  0.198813   19.759274 
2010            310       302       19.268484  19.713741  19.494031  0.112306   19.491565 
2011            310       302       18.744354  19.82      19.289579  0.301206   19.3325   
2012            310       302       19.998032  20.708902  20.325751  0.212958   20.270709 
2013            310       302       18.13142   19.644064  19.004402  0.402952   19.120161 
2014            310       302       18.51729   19.495451  18.913716  0.275945   18.845033 
2015            310       302       19.449839  20.499548  19.87495   0.307923   19.7825   
2016            310       302       20.295872  20.835773  20.501712  0.14247    20.451016 
2017            310       302       19.205097  19.86442   19.502778  0.159635   19.473984 
2018            310       302       17.541388  18.228678  17.856085  0.173737   17.801517 
2019            310       302       17.813032  18.249613  18.053132  0.089826   18.059146 
2020            310       302       18.800064  19.307549  19.035671  0.106957   19.031274 
2021            310       302       20.738806  21.362741  21.107081  0.173052   21.118258 
2022            310       302       17.736517  18.705097  18.161009  0.243536   18.100435 
2023            310       302       18.788668  19.721899  19.291185  0.237191   19.267568