Year	Percent
1984	13
1992	12.6
1994	12.4
1996	13.1
1998	13.1
2000	12.3
2002	12.7
2004	12.9
2005	12.8
2006	13
2008	13.9
2010	13.7
2012	13.5
2014	13.4
2016	14