Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            817       479       11.550754  11.688583  11.654283  0.02488    11.664134 
2008            817       479       10.581535  10.877691  10.770382  0.075733   10.784289 
2009            817       479       10.9968    11.351439  11.2233    0.090398   11.237627 
2010            817       479       11.528575  11.796814  11.72228   0.068776   11.742036 
2011            817       479       11.104539  11.566794  11.373976  0.120943   11.380821 
2012            817       479       11.557667  11.811661  11.723804  0.059343   11.734399 
2013            817       479       11.4244    11.837417  11.703482  0.099027   11.725359 
2014            817       479       12.223454  12.767309  12.551318  0.144974   12.557932 
2015            817       479       12.180676  12.862668  12.577209  0.178029   12.573252 
2016            817       479       11.940486  12.59006   12.306361  0.163438   12.300066 
2017            817       479       11.192739  11.979183  11.659188  0.19495    11.660573 
2018            817       479       11.472186  12.134523  11.888311  0.160059   11.90272  
2019            817       479       11.770061  12.346683  12.138897  0.142959   12.152994 
2020            817       479       12.615707  13.305323  13.038792  0.191835   13.095932 
2021            817       479       12.580061  13.317482  13.038645  0.20123    13.099198 
2022            817       479       11.196266  11.61042   11.417737  0.105554   11.403066 
2023            817       479       12.630099  12.958479  12.839289  0.084412   12.867917