Year	1=low to 6=high
2005	3
2006	3
2007	3.5
2008	3.5
2009	5
2010	5
2011	4.5
2012	4.5
2013	4.5
2014	4.5
2015	4.5
2016	4.5
2017	4.5
2018	4.5
2019	4.5
2020	4
2021	4
2022	4
2023	4