Year	Percent
1979	0.09448
1990	0.45
1991	0.45
1992	0.45
1993	0.4
1994	0.4
1995	0.4
1996	0.4
1997	0.4
1998	0.4
1999	0.4
2000	0.4
2001	0.4
2002	0.4
2003	0.4
2004	0.4
2005	0.4
2006	0.4
2007	0.4
2008	0.45
2009	0.3
2010	0.3
2011	0.3