Year	Percent
1985	0.01087
1990	0.3
1991	0.4
1992	0.6
1993	0.8
1994	0.9
1995	1.1
1996	1.1
1997	1.2
1998	1.2
1999	1.2
2000	1.2
2001	1.2
2002	1.1
2003	1.1
2004	1
2005	1
2006	0.9
2007	0.9
2008	0.8
2009	0.7
2010	0.7
2011	0.6