Year	1=low to 6=high
2005	3.685714285714286
2006	3.6642857142857146
2007	3.75
2008	3.783333333333333
2009	3.7307692307692313
2010	3.730769230769231
2011	3.638461538461539
2012	3.585714285714286
2013	3.5785714285714287
2014	3.4545454545454546
2015	3.436363636363636
2016	3.427272727272727
2017	3.409090909090909
2018	3.436363636363636
2019	3.4909090909090903
2020	3.4599999999999995
2021	3.4599999999999995
2022	3.4699999999999998
2023	3.499999999999999