Year	Per 100 People
1960	22.63493
1965	27.22104
1970	29.83976
1975	32.01808
1976	33.93831
1977	34.29093
1978	34.90455
1979	35.17179
1980	36.11664
1981	37.07235
1982	37.56347
1983	38.1117
1984	38.84511
1985	39.62449
1986	40.3539
1987	41.38044
1988	42.18685
1989	42.96395
1990	43.22912
1991	43.32346
1992	43.78877
1993	44.69115
1994	45.75966
1995	46.77632
1996	46.44708
1997	47.34085
1998	47.80688
1999	48.01826
2000	47.44754
2001	46.6487
2002	44.53465
2003	44.70336
2004	44.12516
2005	41.8102
2006	42.08504
2007	41.26652
2008	40.90386
2009	43.25217
2010	43.01998
2011	42.54968
2012	42.07941
2013	40.95161
2014	40.51065
2015	40.09074
2016	37.76149
2017	29.0704