Year	1=low to 6=high
2005	3.0285714285714285
2006	2.9444444444444446
2007	2.9583333333333335
2008	3.0135135135135136
2009	2.986842105263158
2010	2.973684210526316
2011	2.9210526315789473
2012	2.9210526315789473
2013	2.8947368421052633
2014	2.8947368421052633
2015	2.9078947368421053
2016	2.9324324324324325
2017	2.9210526315789473
2018	2.918918918918919
2019	2.8947368421052633
2020	2.9210526315789473
2021	2.972972972972973
2022	2.960526315789474
2023	2.986842105263158