Year	1=low to 6=high
2005	3.3492063492063497
2006	3.3389743589743595
2007	3.3615384615384616
2008	3.3353846153846147
2009	3.3482587064676608
2010	3.328358208955224
2011	3.314009661835748
2012	3.284037558685447
2013	3.287037037037038
2014	3.289351898148147
2015	3.252314629629629
2016	3.2323941314553983
2017	3.1990740740740753
2018	3.1995305164319254
2019	3.166666652968036
2020	3.15296803652968
2021	3.166666680555555
2022	3.166666662162162
2023	3.175675675675676