Year	1=low to 6=high
2005	2.9583333333333335
2006	2.9864864864864864
2007	3.0135135135135136
2008	2.9864864864864864
2009	2.973684210526316
2010	2.9342105263157894
2011	2.9473684210526314
2012	2.9210526315789473
2013	2.9078947368421053
2014	2.8947368421052633
2015	2.8552631578947367
2016	2.7972972972972974
2017	2.789473684210526
2018	2.7837837837837838
2019	2.736842105263158
2020	2.6842105263157894
2021	2.689189189189189
2022	2.6973684210526314
2023	2.723684210526316