Year	1=low to 6=high
2005	3
2006	2.5
2007	2
2008	2
2009	2
2010	2
2011	2
2012	2
2013	2.5
2014	3
2015	3
2016	3
2017	3
2018	3
2019	2.5
2020	3
2021	3
2022	3
2023	2.5