Year	Percent
1979	0.05669
1990	0.4
1991	0.5
1992	0.6
1993	0.7
1994	0.8
1995	0.9
1996	0.9
1997	1
1998	1
1999	1
2000	1
2001	0.9
2002	0.9
2003	0.9
2004	0.9
2005	0.9
2006	0.9
2007	0.8
2008	0.9
2009	0.8
2010	0.7
2011	0.7