Year	1=low to 6=high
2005	3.1125
2006	3.1341463414634148
2007	3.1707317073170733
2008	3.1219512195121952
2009	3.1341463414634148
2010	3.1219512195121952
2011	3.1547619047619047
2012	3.0714285714285716
2013	3.046511627906977
2014	3.048780487804878
2015	2.9878048780487805
2016	2.9210526315789473
2017	2.9078947368421053
2018	2.9078947368421053
2019	2.8974358974358974
2020	2.8684210526315788
2021	2.8157894736842106
2022	2.8461538461538463
2023	2.8846153846153846