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