Year	Per 100 People
1960	27.83634
1965	26.74092
1970	30.36442
1975	35.74851
1976	36.72329
1977	37.5712
1978	38.60651
1979	39.5213
1980	40.66849
1981	41.52492
1982	41.27416
1983	41.38202
1984	46.25146
1985	48.23642
1986	49.40477
1987	50.60006
1988	51.86251
1989	53.60353
1990	55.23416
1991	56.39205
1992	57.23784
1993	58.22377
1994	59.43049
1995	59.89416
1996	60.6776
1997	62.40145
1998	63.93371
1999	66.92086
2000	67.80373
2001	68.09406
2002	65.84104
2003	65.1705
2004	64.36111
2005	56.20668
2006	55.86071
2007	55.36664
2008	54.63328
2009	55.36577
2010	53.83294
2011	52.90889
2012	50.7898
2013	47.99536
2014	46.07141
2015	43.42809
2016	41.76245
2017	40.13973