Year	Per 100 People
1970	0.22459
1976	0.33413
1977	0.37309
1978	0.57088
1979	0.52156
1981	0.9394
1982	1.00024
1983	1.07737
1984	1.14784
1985	1.19808
1986	1.42597
1987	1.67385
1988	2.0011
1989	2.35462
1990	2.79551
1991	3.32138
1992	3.60854
1993	4.11204
1994	4.77392
1995	5.45847
1996	5.88755
1997	6.7986
1998	7.42368
1999	8.08025
2000	8.71376
2001	9.49109
2002	9.73395
2003	9.94544
2004	10.14841
2005	10.12935
2006	9.83013
2007	9.83813
2008	13.59932
2009	8.60082
2010	7.78468
2011	6.42016
2012	5.99167
2013	5.67619
2014	5.52337
2015	5.23682
2016	4.94113
2017	4.67009