Year	per 1000 people
1960	0.8
1961	0.9
1962	0.9
1963	0.9
1964	0.9
1965	0.9
1966	0.9
1967	0.9
1968	0.9
1969	0.9
1970	0.9
1971	1
1972	1
1973	1.1
1974	1.1
1975	1.1
1976	1.2
1977	1.2
1978	1.2
1979	1.3
1980	1.3
1981	1.3
1982	1.3
1983	1.4
1984	1.4
1985	1.4
1986	1.4
1987	1.5
1988	1.5
1989	1.5
1990	1.6
1991	1.6
1992	1.6
1993	1.7
1994	1.7
1995	1.7
1996	1.8
1997	2.294
1998	1.9
1999	1.9
2000	1.9
2001	2
2002	2.3
2003	2.2
2010	2.697
2011	2.745
2012	2.757
2013	2.778
2014	2.806
2015	2.807
2016	2.825