Year	Per 100 People
1960	1.66827
1965	2.05284
1970	2.70157
1975	3.38329
1976	3.40081
1977	3.6155
1978	3.81403
1979	3.77044
1980	3.87809
1981	3.99796
1982	4.45455
1983	4.37511
1984	4.9635
1985	5.48919
1986	5.67984
1987	5.93453
1988	6.27847
1989	6.47309
1990	7.04586
1991	7.54157
1992	7.93533
1993	8.67372
1994	9.54009
1995	10.34359
1996	12.20912
1997	13.95963
1998	16.2281
1999	16.73918
2000	17.80216
2001	17.98424
2002	18.68062
2003	18.6189
2004	17.76202
2005	17.73984
2006	17.93105
2007	17.85729
2008	17.65851
2009	16.4564
2010	15.64996
2011	15.35713
2012	15.07233
2013	15.08452
2014	15.02542
2015	14.74071
2016	14.62587
2017	14.24145