Year	1=low to 6=high
2005	3.3
2006	3.3
2007	3.3
2008	3.5
2009	3.5
2010	3.6
2011	3.5
2012	3.5
2013	3.5
2014	3.5
2015	3.5
2016	3.5
2017	3.5
2018	3.5
2019	3.625
2020	3.5
2021	3.5
2022	3.5
2023	3.5555555555555554