Year	Percent
1980	0.001
1981	0.001
1982	0.001
1983	0.001
1984	0.001
1985	0.001
1986	0.001
1987	0.001
1988	0.001
1989	0.001
1990	0.001
1991	0.001
1992	0.001
1993	0.001
1994	0.001
1995	0.001
1996	0.001
1997	0.001
1998	0.001
1999	0.001
2000	0.001
2001	0.001
2002	0.001
2003	0.001
2004	0.001
2005	0.001
2006	0.001
2007	0.001
2008	0.001
2009	0.001
2010	0.001
2011	0.001