Year	Percent
1979	0.03122
1990	0.4
1991	0.4
1992	0.4
1993	0.4
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	0.3
2007	0.3
2008	0.3
2009	0.2
2010	0.2
2011	0.2