Year	Per 100 People
1960	6.06451
1965	8.96627
1970	12.89209
1975	19.70491
1976	21.24137
1977	22.87674
1978	24.71237
1979	26.6872
1980	28.792
1981	30.54765
1982	32.07858
1983	33.51143
1984	34.71462
1985	35.84289
1986	36.9612
1987	38.04951
1988	39.18764
1989	40.36668
1990	41.72944
1991	43.02467
1992	44.26667
1993	45.36063
1994	46.45404
1995	47.51993
1996	48.66135
1997	49.41443
1998	49.84424
1999	48.92491
2000	49.53356
2001	49.3594
2002	47.73547
2003	47.42013
2004	46.50226
2005	45.30117
2006	43.51376
2007	40.99
2008	39.3958
2009	38.86482
2010	40.40453
2011	40.04793
2012	39.68278
2013	38.86786
2014	40.75999
2015	41.59515
2016	40.94518
2017	43.07505