Year	Percent
1987	8.1
1994	7.7
1998	8.1
1999	6.5
2000	7
2003	7.4
2004	7.3
2005	7.4
2006	7.7
2007	7.4
2008	8.1
2009	8.5
2010	8.4
2011	9
2012	9
2013	8.7
2014	9.3
2015	9.1
2016	9.4