Year	Per 100 People
1960	9.25536
1965	12.91328
1970	17.68032
1975	25.42807
1976	27.24145
1977	28.60083
1978	29.76835
1979	30.80903
1980	31.67027
1981	33.33333
1982	35.02155
1983	35.61745
1984	37.76428
1985	38.77954
1986	39.74
1987	41.70009
1988	44.17938
1989	46.46062
1990	47.95773
1991	49.97366
1992	50.40445
1993	49.86278
1994	48.94486
1995	48.31885
1996	49.62439
1997	50.93295
1998	51.59296
1999	52.94544
2000	52.79953
2001	48.7228
2002	51.0959
2003	50.63576
2004	49.76424
2005	49.3383
2006	47.62623
2007	46.35692
2008	45.00773
2009	43.12715
2010	41.5551
2011	40.24235
2012	38.39436
2013	44.26324
2014	42.99373
2015	41.01501
2016	41.11204