Year	Per 100 People
1960	2.58206
1970	12.2124
1975	19.75974
1976	20.8806
1977	22.10163
1978	23.29674
1979	24.48218
1980	26.01718
1981	27.56041
1982	28.91516
1983	30.35198
1984	31.65312
1985	33.05476
1986	34.6081
1987	36.64364
1988	39.05736
1989	41.15012
1990	42.80923
1991	45.13793
1992	47.63743
1993	50.00633
1994	52.01049
1995	53.38437
1996	55.29231
1997	57.367
1998	57.60404
1999	58.80016
2000	58.91427
2001	57.97948
2002	56.68813
2003	56.12096
2004	55.32225
2005	55.55133
2006	55.91437
2007	61.01599
2008	60.27122
2009	61.25061
2010	62.08586
2011	61.45406
2012	61.65647
2013	61.82247
2014	61.40548
2015	59.78338
2016	59.1324
2017	57.93489