Year	per 1,000 people
1960	16
1961	16.1
1962	16
1963	15.8
1964	16
1965	16
1966	15.6
1967	14.8
1968	14
1969	13.3
1970	13
1971	13
1972	11.8
1973	10.8
1974	11.1
1975	11.1
1976	10.9
1977	11.2
1978	11.2
1979	11.2
1980	11.4
1981	12.1
1982	11.8
1983	11.4
1984	11.5
1985	11.2
1986	11.7
1987	11.4
1988	12.3
1989	12.4
1990	12.9
1991	12.9
1992	13.1
1993	13.5
1994	13.5
1995	13.3
1996	13.7
1997	13.1
1998	12.7
1999	13
2000	13.1
2001	12.4
2002	12
2003	11.7
2004	11.9
2005	11.5
2006	11.7
2007	11.4
2008	11.5
2009	11.3
2010	11.6
2011	10.9
2012	11.3
2013	11.3
2014	10.9
2015	10.7
2016	10.4
2017	10.4
2018	10.3
2019	10
2020	10.2
2021	10.5
2022	9.9