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