Year	1=low to 6=high
2005	3.357142857142857
2006	3.3230769230769233
2007	3.3615384615384616
2008	3.3923076923076922
2009	3.373134328358209
2010	3.343283582089552
2011	3.347826086956522
2012	3.295774647887324
2013	3.3055555555555554
2014	3.3402777777777777
2015	3.3194444444444446
2016	3.2535211267605635
2017	3.1805555555555554
2018	3.1619718309859155
2019	3.136986301369863
2020	3.1575342465753424
2021	3.138888888888889
2022	3.1283783783783785
2023	3.0945945945945947