Year	Percent
1985	0.05402
1990	0.2
1991	0.2
1992	0.3
1993	0.3
1994	0.3
1995	0.3
1996	0.3
1997	0.3
1998	0.3
1999	0.3
2000	0.3
2001	0.3
2002	0.3
2003	0.3
2004	0.3
2005	0.3
2006	0.4
2007	0.4
2008	0.4
2009	0.4
2010	0.4
2011	0.4