Year	Per 100 People
1991	0.01
1992	0.02
1993	0.02
1994	0.02
1995	0.03
1996	0.04
1997	0.98
1998	1.96
1999	2.92
2000	3.84
2001	4.68
2002	5.43
2003	6.96
2004	8.37