Year	Percent
1985	0.01102
1990	0.06
1991	0.06
1992	0.1
1993	0.1
1994	0.1
1995	0.2
1996	0.3
1997	0.4
1998	0.6
1999	0.8
2000	0.9
2001	1.1
2002	1.2
2003	1.3
2004	1.4
2005	1.5
2006	1.6
2007	1.6
2008	1.6
2009	1.6
2010	1.6
2011	1.6