Year	Percent
1989	6.3
1991	4
1992	7
1993	8.9
1994	4.5
1995	4
1996	5.6
1997	3.5
1998	3.4
1999	2.3
2000	3.8
2001	4.1
2002	2.6
2004	3.1
2006	3.7
2007	1.8
2008	2
2010	3.2
2012	2.5
2014	2.3