Year	Percent
1990	0.15
1991	0.52
1992	0.76
1993	1.36
1994	1.02
1995	0.9
1996	1.6
1997	1.34
1998	1.78
1999	1.78
2000	1.27
2001	1.12
2002	1.45
2003	2.11
2004	2.4
2005	2.66
2006	2.46
2007	2.01