Year	1=low to 6=high
2005	2.8499999999999996
2006	2.8499999999999996
2007	2.8499999999999996
2008	2.9
2009	2.9
2010	2.8499999999999996
2011	2.8499999999999996
2012	2.7
2013	2.75
2014	2.7
2015	2.55
2016	2.45
2017	2.25
2018	2.35
2019	2.4
2020	2.45
2021	2.4
2022	2.35
2023	2.3