Year	1=low to 6=high
2005	3.002777777777778
2006	2.975675675675676
2007	2.972972972972973
2008	2.954054054054054
2009	2.9631578947368418
2010	2.9526315789473685
2011	2.971052631578947
2012	2.9368421052631573
2013	2.934210526315789
2014	2.944736842105262
2015	2.9499999999999993
2016	2.962162162162162
2017	2.921052631578947
2018	2.9459459459459456
2019	2.9078947368421053
2020	2.8921052631578954
2021	2.878378378378379
2022	2.8342105263157897
2023	2.813157894736843