Year	Per 100 People
1960	3.87829
1965	7.51572
1970	15.63298
1975	28.79925
1976	30.29639
1977	31.20626
1978	32.11141
1979	33.03529
1980	33.89196
1981	33.91838
1982	34.69519
1983	35.60277
1984	36.26949
1985	37.16323
1986	38.17509
1987	39.33865
1988	40.72949
1989	42.27783
1990	43.79208
1991	45.02954
1992	45.9963
1993	46.79545
1994	48.14253
1995	49.29121
1996	50.56057
1997	51.79956
1998	49.09512
1999	48.73221
2000	48.58087
2001	48.01448
2002	47.51463
2003	47.02119
2004	46.49116
2005	45.23525
2006	43.62508
2007	39.86997
2008	37.67144
2009	51.95301
2010	51.04457
2011	50.32359
2012	50.00939
2013	49.89308
2014	49.5911
2015	49.7797
2016	50.17607
2017	50.15599