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