Year	Per 100 People
1960	15.17991
1965	17.6885
1970	21.05442
1975	25.58707
1976	26.43873
1977	27.60728
1978	29.11355
1979	30.74272
1980	32.37508
1981	34.16345
1982	35.61298
1983	36.64899
1984	37.77693
1985	39.33233
1986	40.66934
1987	41.93373
1988	42.90775
1989	44.18683
1990	45.69387
1991	46.58457
1992	47.22077
1993	48.28274
1994	49.48907
1995	49.23453
1996	50.18694
1997	50.62924
1998	51.11158
1999	51.73845
2000	52.71208
2001	52.20948
2002	53.40127
2003	53.10461
2004	51.98404
2005	50.00271
2006	48.31433
2007	46.59453
2008	43.90302
2009	49.2616
2010	48.03331
2011	47.03334
2012	45.88147
2013	44.70702
2014	39.14858
2015	35.71495
2016	33.90554
2017	34.60043