Year	per 1,000 people
1960	18.5
1961	18.4
1962	18.1
1963	18.2
1964	17.7
1965	17.1
1966	17
1967	16.8
1968	15.9
1969	14.6
1970	14
1971	13.2
1972	12.7
1973	12.2
1974	13.3
1975	13.9
1976	14.1
1977	13.9
1978	13.5
1979	13.3
1980	13.2
1981	13.2
1982	13.7
1983	13.8
1984	13.3
1985	12.8
1986	12.3
1987	12.1
1988	12.8
1989	12.8
1990	13.1
1991	13
1992	13.2
1993	12.8
1994	12.8
1995	12.3
1996	11.8
1997	11.5
1998	11.1
1999	11.1
2000	11
2001	10.8
2002	10.7
2003	10.9
2004	11
2005	11
2006	11.2
2007	11.1
2008	11.2
2009	11.3
2010	11.4
2011	11.1
2012	11
2013	10.7
2014	10.5
2015	10.1
2016	9.6
2017	9.1
2018	8.6
2019	8.3
2020	8.4
2021	9
2022	8.1