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