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