Year	Per 100 People
1960	0.63828
1965	0.59034
1970	0.56875
1975	0.61785
1976	0.67543
1977	0.72973
1978	0.78085
1979	0.78799
1980	0.83417
1981	0.86488
1982	0.91089
1983	0.93575
1984	0.97752
1985	1.06686
1986	1.09315
1987	1.13282
1988	1.19562
1989	1.37009
1990	1.61983
1991	1.96157
1992	2.53572
1993	3.15199
1994	3.7762
1995	4.16617
1996	4.39903
1997	4.6738
1998	4.94531
1999	5.15872
2000	4.93941
2001	4.08245
2002	3.82025
2003	4.0853
2004	4.33598
2005	4.3942
2006	4.10154
2007	7.66597
2008	9.46663
2009	10.99185
2010	11.56867
2011	10.85272
2012	9.83703
2013	8.6471
2014	7.24906
2015	6.38551
2016	5.86837
2017	5.72584