Year	Percent
1988	0.4438
1989	0.09048
1990	0.2929
1992	1.456
1993	0.8202
1995	2.422
1996	0.2353
1997	1.01
1998	0.4068
1999	0.8927
2000	0.9579
2001	3.538
2002	1.149
2003	1.824
2004	2.668
2005	1.398
2006	1.993
2007	3.215