Year	1=low to 6=high
2005	3.5636363636363635
2006	3.580357142857143
2007	3.641509433962264
2008	3.650943396226415
2009	3.6018518518518516
2010	3.5462962962962963
2011	3.518181818181818
2012	3.5
2013	3.491228070175439
2014	3.451923076923077
2015	3.423076923076923
2016	3.3877551020408165
2017	3.336734693877551
2018	3.316326530612245
2019	3.3
2020	3.3020833333333335
2021	3.28125
2022	3.2653061224489797
2023	3.2244897959183674