Year	Per 100 People
1970	8.16077
1975	14.50935
1976	13.5635
1977	15.01275
1978	16.22585
1979	16.4937
1980	16.72423
1984	17.74409
1985	19.52044
1986	18.95537
1987	23.99753
1988	29.93581
1989	34.45283
1990	39.35362
1991	43.46876
1992	44.39576
1993	45.35389
1994	48.5154
1995	51.0121
1996	51.08055
1997	50.85625
1998	50.7048
1999	50.52506
2000	50.37539
2001	49.79843
2002	54.36853
2003	71.87727
2004	76.95754
2005	68.04213
2006	64.35055
2007	59.65388
2008	55.58116
2009	51.29882
2010	46.85939
2011	44.85144
2012	43.03202
2013	41.57489
2014	40.04664
2015	39.03298
2016	36.42086
2017	32.06821