Year	Per 100 People
1960	9.11584
1965	12.27921
1970	16.93593
1975	24.37645
1976	26.18771
1977	28.30795
1978	30.60556
1979	32.73106
1980	34.57702
1981	35.87869
1982	37.01238
1983	38.02195
1984	39.0857
1985	40.12003
1986	41.30653
1987	42.45828
1988	43.76596
1989	44.99398
1990	46.37349
1991	47.62847
1992	48.76083
1993	49.99998
1994	51.135
1995	52.52184
1996	54.17247
1997	56.59362
1998	59.29893
1999	60.70529
2000	62.0927
2001	50.92984
2002	49.81889
2003	48.42926
2004	48.26495
2005	46.43445
2006	45.31569
2007	44.85536
2008	44.1627
2009	43.64006
2010	43.34973
2011	42.61815
2012	42.77777
2013	42.31362
2014	41.12649
2015	41.03981
2016	39.87678
2017	38.454