Year	1=low to 6=high
2005	3.7
2006	3.7399999999999998
2007	3.7
2008	3.7199999999999998
2009	3.6799999999999997
2010	3.6399999999999997
2011	3.6399999999999997
2012	3.6
2013	3.6
2014	3.56
2015	3.54
2016	3.5
2017	3.5200000000000005
2018	3.56
2019	3.6
2020	3.6199999999999997
2021	3.5799999999999996
2022	3.5799999999999996
2023	3.62