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