Year	1=low to 6=high
2005	3.3991228070175445
2006	3.3829059829059824
2007	3.4088888888888884
2008	3.3959999999999995
2009	3.404761904761905
2010	3.3809523809523823
2011	3.3568376068376082
2012	3.329166666666667
2013	3.3312757201646086
2014	3.2982456140350873
2015	3.258771710526316
2016	3.2374426484018253
2017	3.2072072072072073
2018	3.2077625570776243
2019	3.173333328888889
2020	3.1529680365296806
2021	3.166666680555555
2022	3.1666666621621617
2023	3.175675675675676