Year	Per 100 People
1970	2.01613
1975	3.27961
1976	3.3271
1977	3.4565
1978	3.66665
1979	3.95563
1980	4.06824
1981	4.18081
1982	4.08819
1983	4.07365
1984	5.34917
1985	5.98333
1986	6.38319
1987	6.79366
1988	8.17626
1989	9.2096
1990	12.30235
1991	12.25064
1992	14.2984
1993	16.8725
1994	17.22032
1995	20.79378
1996	22.67255
1997	24.48407
1998	26.35606
1999	28.6553
2000	31.15662
2001	31.55291
2002	31.99802
2003	30.43989
2004	25.88582
2005	23.82203
2006	23.79404
2007	23.72436
2008	24.19336
2009	22.54739
2010	21.70008
2011	20.65442
2012	21.07244
2013	19.07093
2014	18.61003
2015	19.67992
2016	19.96742
2017	19.57796