Year	per 1,000 people
1960	17.9
1961	18.6
1962	18.7
1963	18.8
1964	18.5
1965	17.9
1966	17.6
1967	17.3
1968	17
1969	16.3
1970	15
1971	14.5
1972	13.8
1973	12.9
1974	12.8
1975	12.4
1976	11.6
1977	11.3
1978	11.3
1979	11.4
1980	12
1981	12.4
1982	12.5
1983	11.9
1984	11.8
1985	11.6
1986	11.5
1987	11.4
1988	11.6
1989	11.6
1990	11.8
1991	12.2
1992	12.2
1993	12
1994	11.6
1995	11.2
1996	11.2
1997	10.5
1998	10.2
1999	9.8
2000	9.8
2001	9.4
2002	9.7
2003	9.5
2004	9.7
2005	9.5
2006	9.4
2007	9.2
2008	9.3
2009	9.2
2010	9.4
2011	9.3
2012	9.4
2013	9.4
2014	9.6
2015	9.8
2016	10
2017	10
2018	9.7
2019	9.6
2020	9.4
2021	9.6
2022	9.1