Year	per 1000 people
1960	1.3
1961	1.3
1962	1.4
1963	1.4
1964	1.4
1965	1.5
1966	1.5
1967	1.5
1968	1.6
1969	1.6
1971	1.5
1972	1.6
1973	1.7
1974	1.8
1975	1.9
1976	1.9
1977	2
1978	2.1
1979	2.2
1980	2.3
1981	2.4
1982	2.5
1983	2.8
1984	2.7
1985	2.8
1986	2.9
1987	3
1988	3.1
1989	3.2
1990	3.3
1991	3.3
1992	3.4
1993	3.4
1994	3.5
1995	3.5
1996	3.6
1997	3.7
1998	3.7
1999	3.8
2000	3.9
2001	3.9
2002	3.9
2005	2.045
2006	2.093
2010	2.911
2011	2.924
2012	2.941
2013	2.959
2014	2.971
2015	3.011