Year	1=low to 6=high
2005	3.2407407407407414
2006	3.261111111111111
2007	3.2870370370370368
2008	3.2888888888888888
2009	3.342592592592593
2010	3.314814814814815
2011	3.2870370370370368
2012	3.2192982456140355
2013	3.184210526315789
2014	3.2129622222222216
2015	3.1296292592592585
2016	3.0277777777777777
2017	2.912280701754385
2018	2.9351851851851856
2019	2.9122807017543857
2020	2.903508771929825
2021	2.912280736842105
2022	2.894736947368421
2023	2.912280684210527