Year	1=low to 6=high
2005	3.62
2006	3.6
2007	3.7375000000000003
2008	3.7874999999999996
2009	3.7333333333333334
2010	3.755555555555555
2011	3.7375
2012	3.75
2013	3.7249999999999996
2014	3.5799999999999996
2015	3.6
2016	3.6
2017	3.6
2018	3.62
2019	3.66
2020	3.65
2021	3.625
2022	3.65
2023	3.675