Year	Percent
1990	0
1991	0
1992	0
1993	1.246
1994	1.733
1995	1.446
1996	1.503
1997	1.583
1998	1.54
1999	1.751
2000	9.224
2001	9.98
2002	11.68
2003	11.35
2004	10.08
2005	9.124
2006	8.793
2007	7.414
2008	12.6
2009	17.04
2010	14.3