Year	Per 100 People
1960	1.70804
1965	1.89159
1970	2.47808
1975	2.84605
1976	2.90516
1977	3.01865
1978	3.15622
1979	3.16305
1980	3.22202
1981	3.38055
1982	3.4797
1983	3.70298
1984	4.01315
1985	4.40923
1986	4.50567
1987	4.61163
1988	4.88301
1989	4.95834
1990	6.5258
1991	7.84728
1992	9.38516
1993	10.951
1994	11.2622
1995	12.7163
1996	14.83671
1997	18.32811
1998	20.46445
1999	20.61955
2000	21.63763
2001	22.52185
2002	22.19082
2003	20.58327
2004	20.94121
2005	21.43204
2006	20.73309
2007	20.97791
2008	21.15474
2009	21.12554
2010	20.35718
2011	19.64691
2012	19.02109
2013	19.16758
2014	19.46059
2015	19.39955
2016	18.84469
2017	17.68585