Year	1=low to 6=high
2005	3.3230769230769237
2006	3.2923076923076926
2007	3.3600000000000003
2008	3.3800000000000003
2009	3.3800000000000003
2010	3.37
2011	3.377777777777778
2012	3.388888888888889
2013	3.4000000000000004
2014	3.375
2015	3.35
2016	3.3499999999999996
2017	3.3499999999999996
2018	3.3
2019	3.3