Year	1=low to 6=high
2005	4
2006	4
2007	4.5
2008	4.5
2009	4.5
2010	4.5
2011	4
2012	3.5
2013	3.5
2014	3.5
2015	3.5
2016	3.5
2017	4
2018	4
2019	4
2020	4
2021	4
2022	3.5
2023	3.5