Year	1=low to 6=high
2005	3.15563063063063
2006	3.153378378378379
2007	3.1772522522522526
2008	3.1621621621621627
2009	3.176754385964912
2010	3.180921052631579
2011	3.2046052631578954
2012	3.1739316239316246
2013	3.170940170940171
2014	3.186404561403509
2015	3.172149824561403
2016	3.136842105263159
2017	3.1017094017094022
2018	3.1285087719298246
2019	3.1
2020	3.1091880341880347
2021	3.115598307692308
2022	3.1279914871794867
2023	3.139743641025641