Year	Percent
1979	0.01185
1990	0.3
1991	0.5
1992	1
1993	1.7
1994	2.5
1995	3.1
1996	3.4
1997	3.6
1998	3.5
1999	3.4
2000	3.3
2001	3.1
2002	2.8
2003	2.6
2004	2.4
2005	2.2
2006	2
2007	1.8
2008	1.6
2009	1.3
2010	1.1
2011	1