Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            526       485       23.637592  23.994549  23.850784  0.071945   23.870386 
2008            526       485       23.385746  23.745377  23.620098  0.073765   23.6348   
2009            526       485       23.473267  23.844284  23.715268  0.077813   23.72488  
2010            526       485       23.137403  23.443918  23.331258  0.062663   23.339705 
2011            526       485       23.601397  23.981583  23.846773  0.082204   23.858137 
2012            526       485       23.947121  24.295008  24.180499  0.085181   24.215353 
2013            526       485       23.139671  23.496973  23.381989  0.0809     23.412762 
2014            526       485       22.767557  23.097723  23.002767  0.074304   23.028244 
2015            526       485       23.407845  23.760118  23.651662  0.083191   23.683046 
2016            526       485       23.77733   24.150972  24.033308  0.085532   24.06749  
2017            526       485       23.988178  24.305471  24.201853  0.073807   24.224857 
2018            526       485       23.383022  23.823231  23.658902  0.098557   23.668356 
2019            526       485       22.973091  23.408272  23.252819  0.098816   23.285872 
2020            526       485       23.69688   23.892473  23.81419   0.045056   23.821365 
2021            526       485       23.441656  23.553614  23.500316  0.024397   23.502529 
2022            526       485       23.101213  23.472631  23.35346   0.087843   23.38678  
2023            526       485       23.787863  23.903557  23.868958  0.02308    23.872526