Year	Percent
1979	0.01
1990	1.1
1991	1.2
1992	1.4
1993	1.4
1994	1.5
1995	1.5
1996	1.5
1997	1.4
1998	1.4
1999	1.3
2000	1.3
2001	1.2
2002	1.1
2003	1.1
2004	1
2005	0.9
2006	0.9
2007	0.8
2008	0.8