Year	1=low to 6=high
2005	3.4210526315789473
2006	3.3421052631578947
2007	3.3157894736842106
2008	3.289473684210526
2009	3.325
2010	3.3
2011	3.325
2012	3.325
2013	3.35
2014	3.3
2015	3.35
2016	3.35
2017	3.325
2018	3.325
2019	3.3
2020	3.3
2021	3.35
2022	3.3
2023	3.35