Year	Percent
1992	8
1996	7
1999	6.5
2000	6.7
2001	6.9
2002	6.9
2003	7.5
2004	7.1
2005	7.4
2008	6.9
2009	7.1
2010	7
2011	7.3
2012	7.4
2013	7.5
2014	7.5
2015	7.9
2016	8