Year	1=low to 6=high
2005	3.0694444444444446
2006	2.9594594594594597
2007	2.9594594594594597
2008	2.9594594594594597
2009	2.9342105263157894
2010	3
2011	3.0921052631578947
2012	3.1184210526315788
2013	3.0921052631578947
2014	3.1578947368421053
2015	3.1973684210526314
2016	3.1486486486486487
2017	3.1315789473684212
2018	3.175675675675676
2019	3.1973684210526314
2020	3.223684210526316
2021	3.189189189189189
2022	3.1973684210526314
2023	3.1842105263157894