Year	1=low to 6=high
2005	3.5
2006	3.5
2007	3.5
2008	3.5
2009	3.5
2010	3.5
2011	3.5
2012	4
2013	4
2014	4
2015	4.5
2016	4.5
2017	4.5
2018	5
2019	5
2020	5
2021	5
2022	5
2023	5