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