Year	1=low to 6=high
2005	3.1973684210526314
2006	3.1825
2007	3.1958333333333337
2008	3.18
2009	3.1788617886178865
2010	3.1382113821138216
2011	3.1463414634146343
2012	3.120155038759691
2013	3.143939393939395
2014	3.162791240310078
2015	3.1279073643410857
2016	3.1046511627906983
2017	3.0568181818181817
2018	3.089147286821705
2019	3.0303030075757578
2020	3.0189393939393936
2021	3.0348837209302326
2022	3.0189393863636367
2023	3.022727272727273