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