Year	1=low to 6=high
2005	3.5
2006	3.5
2007	4
2008	4
2009	4
2010	4
2011	4
2012	3.5
2013	3.5
2014	3.5
2015	3.5
2016	3.5
2017	3
2018	3
2019	3
2020	3
2021	3.5
2022	3.5
2023	3.5