Year	per 1000 people
1960	1.5
1961	1.6
1962	1.7
1963	1.7
1964	1.8
1965	1.9
1966	1.9
1967	2
1968	1.9
1969	2
1970	2
1971	2.1
1972	2.1
1973	2.2
1974	2.2
1975	2.2
1976	2.3
1977	2.3
1978	2.4
1979	2.5
1980	2.3
1981	2.3
1982	2.4
1983	2.4
1984	2.5
1985	2.5
1986	2.6
1987	2.7
1988	2.7
1989	2.7
1990	3.166
1991	3.265
1992	3.333
1993	3.29
1994	3.342
1995	3.346
1996	3.389
1997	3.441
1998	3.515
1999	3.549
2002	3.668
2003	3.771
2004	3.843
2005	3.225
2006	3.5
2007	3.2
2008	3.591
2009	3.507
2010	2.864
2011	2.953
2012	3.077
2013	3.199
2014	3.316
2015	3.093