Year	1=low to 6=high
2005	3
2006	2.5
2007	2
2008	2.5
2009	3
2010	3
2011	3.5
2012	3.5
2013	3.5
2014	3.5
2015	3.5
2016	3
2017	3
2018	3
2019	3
2020	3
2021	3.5
2022	3.5
2023	3.5