Year	1=low to 6=high
2006	3.5
2007	3.5
2008	3.5
2009	3.5
2010	4
2011	4.5
2012	4.5
2013	4.5
2014	4.5
2015	4.5
2016	4
2017	3.5
2018	3.5
2019	3.5
2020	3.5
2021	3.5
2022	3.5
2023	3.5