Year	per 1,000 people
1960	1.269
1965	1.316
1970	1.185
1971	1.208
1973	1.242
1975	1.318
1976	1.332
1977	1.355
1978	1.377
1979	1.413
1980	1.476
1981	1.541
1982	1.635
1983	1.972
1984	1.724
1985	1.762
1986	1.783
1987	1.79
1988	1.805
1989	1.811
1990	1.802
1991	1.816
1992	1.866
1993	1.77
1994	1.772
1998	1.864
2000	1.973
2001	1.999
2002	2.115
2004	2.262
2005	2.247
2006	2.245
2007	2.324
2008	2.44
2009	2.462
2010	2.497
2011	2.53
2012	2.6
2013	2.633
2016	2.256
2017	2.974