Year	Percent
1984	44
1992	43.7
1994	43.5
1996	54.1
1998	50.6
2000	45.1
2002	43.3
2004	39.2
2005	41
2006	33.7
2008	37.5
2010	37.1
2012	36.4
2014	40.5
2016	34.8