Year	1=low to 6=high
2005	2.7777777777777777
2006	2.7567567567567566
2007	2.7432432432432434
2008	2.7162162162162162
2009	2.6973684210526314
2010	2.6578947368421053
2011	2.723684210526316
2012	2.6710526315789473
2013	2.6973684210526314
2014	2.736842105263158
2015	2.6973684210526314
2016	2.6621621621621623
2017	2.6315789473684212
2018	2.6621621621621623
2019	2.6578947368421053
2020	2.6447368421052633
2021	2.608108108108108
2022	2.5921052631578947
2023	2.526315789473684