Year	per 1000 people
1960	0.3
1961	0.3
1962	0.4
1963	0.4
1964	0.3
1965	0.4
1966	0.4
1967	0.4
1968	0.4
1969	0.4
1970	0.4
1971	0.5
1972	0.5
1973	0.5
1974	0.5
1975	0.5
1976	0.6
1977	0.6
1978	0.6
1979	0.6
1980	0.6
1981	0.6
1982	0.7
1983	0.7
1984	0.7
1985	0.7
1986	0.7
1987	0.7
1988	0.8
1989	0.9
1990	0.938
1991	0.97
1992	1.021
1993	1.077
1994	1.143
1995	1.185
1996	1.193
1997	1.22
1998	1.261
1999	1.316
2000	1.348
2001	1.399
2002	1.412
2003	1.43
2004	1.45
2005	1.486
2006	1.521
2007	1.559
2008	1.609
2009	1.665
2010	1.707
2011	1.714
2012	1.734
2013	1.755
2014	1.749