Year	Percent
1983	0.01143
1990	0.1
1991	0.1
1992	0.2
1993	0.3
1994	0.4
1995	0.6
1996	0.7
1997	0.9
1998	0.9
1999	1
2000	1
2001	1
2002	1
2003	1
2004	0.9
2005	0.9
2006	0.9
2007	0.8
2008	0.8
2009	0.8
2010	0.8
2011	0.8