Year	1=low to 6=high
2005	4
2006	4
2007	4.5
2008	4.5
2009	4.5
2010	4
2011	3.5
2012	3.5
2013	3.5
2014	3.5
2015	3.5
2016	3
2017	2.5
2018	2.5
2019	2.5
2020	2.5
2021	2.5
2022	3
2023	3