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