Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            710       666       12.875452  13.513774  13.233904  0.158054   13.259451 
2008            710       666       11.919548  12.178     12.061612  0.057443   12.062645 
2009            710       666       11.306935  11.522806  11.363868  0.044358   11.354048 
2010            710       666       12.157678  12.491194  12.368896  0.081071   12.381355 
2011            710       666       13.214258  13.699871  13.481546  0.113007   13.492903 
2012            710       666       13.084097  13.492032  13.276696  0.080056   13.278161 
2013            710       666       13.075516  13.361838  13.251371  0.055138   13.24858  
2014            710       666       12.685225  12.994774  12.866504  0.065052   12.862726 
2015            710       666       12.06429   12.339193  12.234691  0.069103   12.253064 
2016            710       666       13.120161  13.495774  13.323103  0.095716   13.32679  
2017            710       666       13.236096  13.716452  13.537177  0.101908   13.563339 
2018            710       666       12.594355  13.098354  12.882097  0.126973   12.897274 
2019            710       666       12.488065  12.931452  12.701512  0.104528   12.699306 
2020            710       666       12.325678  12.486259  12.405495  0.04292    12.407435 
2021            710       666       14.429516  14.881774  14.634267  0.091237   14.628113 
2022            710       666       13.303032  13.593419  13.417223  0.07564    13.399613 
2023            710       666       14.104226  14.414613  14.276376  0.058188   14.284451