Year	Per 100 People
1960	9.60652
1965	12.03246
1970	16.55974
1975	23.53592
1976	24.81892
1977	26.78539
1978	29.07383
1979	30.79514
1980	32.27734
1981	33.40126
1982	34.17813
1983	35.2755
1984	36.43798
1985	37.50036
1986	38.40438
1987	39.96529
1988	41.74955
1989	43.48539
1990	44.36258
1991	45.18879
1992	46.11568
1993	47.41678
1994	49.05314
1995	50.72829
1996	52.75012
1997	54.63722
1998	56.07487
1999	57.91131
2000	59.75826
2001	58.4605
2002	58.53111
2003	57.98958
2004	57.73898
2005	56.51064
2006	55.66933
2007	54.48569
2008	55.0805
2009	53.41934
2010	52.77313
2011	52.10997
2012	51.66883
2013	51.64493
2014	51.12318
2015	50.78437
2016	50.94078
2017	50.07535