Year	Per 100 People
1960	2.8128
1965	3.53498
1970	4.45985
1975	5.74253
1976	6.1179
1977	6.49207
1978	6.86496
1979	7.236
1980	7.60474
1981	7.97146
1982	8.53524
1983	9.11587
1984	9.655
1985	10.21194
1986	10.76768
1987	11.32345
1988	12.14073
1989	12.99833
1990	13.65664
1991	14.27075
1992	14.738
1993	15.23921
1994	15.76945
1995	16.32627
1996	18.26918
1997	18.74901
1998	19.49443
1999	20.43789
2000	21.3288
2001	22.04331
2002	22.57897
2003	23.34882
2004	25.71578
2005	24.87964
2006	26.59394
2007	27.82254
2008	28.52975
2009	28.32171
2010	28.26084
2011	27.82341
2012	26.86289
2013	26.22357
2014	24.67398
2015	21.60952
2016	20.14479
2017	17.21883