Year	1=low to 6=high
2005	3.121052631578947
2006	3.068421052631579
2007	3.0947368421052635
2008	3.0947368421052635
2009	3.0900000000000003
2010	3.1350000000000007
2011	3.2199999999999998
2012	3.2099999999999995
2013	3.1999999999999997
2014	3.195
2015	3.1899999999999995
2016	3.2049999999999996
2017	3.2300000000000004
2018	3.245
2019	3.275
2020	3.3
2021	3.3150000000000004
2022	3.37
2023	3.3950000000000005