Year	per 1000 people
1961	1.1
1962	1.2
1963	1.3
1964	1.3
1965	1.3
1966	1.3
1967	1.3
1968	1.3
1969	1.4
1970	1.4
1971	1.5
1972	1.6
1973	1.6
1974	1.6
1975	1.7
1976	1.7
1977	1.7
1978	1.8
1979	1.8
1980	1.8
1981	1.8
1982	1.9
1983	1.9
1984	1.9
1985	2
1986	2
1987	2.1
1988	2.1
1989	2.1
1990	2.1
1991	2.1
1992	2.1
1993	2.2
1994	2.1
1995	2.1
1996	2.1
1997	2.1
1998	1.863
1999	2.1
2001	1.889
2002	1.899
2004	1.899
2006	1.911
2008	1.961
2010	2.041
2013	2.453
2014	2.497
2015	2.539