Year	1=low to 6=high
2005	3.365079365079365
2006	3.3384615384615386
2007	3.353846153846154
2008	3.3846153846153846
2009	3.3955223880597014
2010	3.3955223880597014
2011	3.3550724637681157
2012	3.26056338028169
2013	3.201388888888889
2014	3.1458333333333335
2015	3.1180555555555554
2016	3.0704225352112675
2017	3.0625
2018	3.056338028169014
2019	3.0753424657534247
2020	3.0684931506849313
2021	3.0625
2022	2.9932432432432434
2023	2.9932432432432434