Year	Per 100 People
1960	18.20495
1965	21.65474
1970	25.32837
1975	33.7103
1976	36.11782
1977	38.34214
1978	40.22052
1979	42.10542
1980	43.43868
1981	44.65368
1982	45.89678
1983	46.94198
1984	48.20104
1985	49.72957
1986	51.389
1987	52.9909
1988	54.50019
1989	55.51019
1990	56.62581
1991	57.24168
1992	58.10416
1993	58.94737
1994	59.92757
1995	61.02795
1996	61.8689
1997	63.2945
1998	65.95487
1999	68.3629
2000	71.80043
2001	72.13129
2002	68.88152
2003	67.09245
2004	64.62079
2005	61.75509
2006	56.91417
2007	51.64748
2008	54.11349
2009	50.20066
2010	47.05369
2011	44.44789
2012	40.98106
2013	37.15184
2014	33.05848
2015	29.83101
2016	27.26079
2017	25.11001