Year            Count     Valid     Min        Max        Mean       Stdev      Median
2007            1819      1715      6.676452   8.234968   7.644525   0.327661   7.695452  
2008            1819      1715      7.200968   8.307096   7.881269   0.240654   7.863548  
2009            1819      1715      7.155097   8.153548   7.746319   0.23016    7.764806  
2010            1819      1715      8.127      8.934774   8.519226   0.205546   8.535968  
2011            1819      1715      7.125678   7.974      7.597174   0.193777   7.598871  
2012            1819      1715      8.865774   9.869806   9.456926   0.23909    9.451677  
2013            1819      1715      7.827839   8.911613   8.503775   0.228596   8.479838  
2014            1819      1715      6.831323   7.703452   7.410441   0.15783    7.412871  
2015            1819      1715      6.327065   7.524097   7.053397   0.258013   7.047548  
2016            1819      1715      7.951742   8.555258   8.280542   0.125817   8.267677  
2017            1819      1715      6.498645   7.280226   6.863467   0.167615   6.850323  
2018            1819      1715      8.120646   9.239613   8.808874   0.250997   8.83742   
2019            1819      1715      6.945968   7.884258   7.478322   0.190498   7.441774  
2020            1819      1715      7.633581   8.47771    8.072778   0.160224   8.064838  
2021            1819      1715      8.420096   9.216548   8.877346   0.193707   8.883032  
2022            1819      1715      8.339129   9.401032   8.888275   0.270049   8.853193  
2023            1819      1715      8.245613   9.587807   8.961326   0.28988    8.892161