Year	1=low to 6=high
2005	3.1
2006	3.1
2007	3
2008	3.05
2009	3.1500000000000004
2010	3.2
2011	3.05
2012	3.05
2013	3
2014	3
2015	2.85
2016	2.75
2017	2.65
2018	2.7
2019	2.75
2020	2.8499999999999996
2021	2.8499999999999996
2022	2.8499999999999996
2023	2.8