Year	Per 100 People
1960	0.12726
1965	0.20724
1970	0.26196
1975	0.30064
1976	0.27932
1977	0.25784
1978	0.26049
1979	0.26482
1980	0.27852
1981	0.29176
1982	0.29393
1983	0.2912
1984	0.29219
1985	0.29522
1986	0.30565
1987	0.30854
1988	0.31368
1989	0.31607
1990	0.35809
1991	0.38901
1992	0.39886
1993	0.37892
1994	0.3778
1995	0.37958
1996	0.3765
1997	0.39282
1998	0.43972
1999	0.44397
2000	0.4744
2001	0.46959
2002	0.45647
2003	0.39346
2004	0.37049
2005	0.3154
2006	0.32632
2007	0.35154
2008	0.34282
2009	0.35048
2010	0.36357
2011	0.35334
2012	0.34327
2013	0.29344
2014	0.31918
2015	0.31878
2016	0.28589
2017	0.27148