Year	per 1,000 people
1960	21.7
1961	20.8
1962	19.8
1963	20.4
1964	20.1
1965	19.3
1966	18.5
1967	17.4
1968	17
1969	17.7
1970	17.8
1971	18.2
1972	19.1
1973	20
1974	20.8
1975	20.6
1976	20.8
1977	20.6
1978	20.5
1979	20.3
1980	19.1
1981	18.6
1982	18.3
1983	18.1
1984	17.7
1985	17.5
1986	16.8
1987	16.1
1988	15.9
1989	15.2
1990	15.1
1991	14.8
1992	14.1
1993	13.8
1994	12.4
1995	11.5
1996	11.2
1997	11
1998	10.7
1999	10.4
2000	10.2
2001	9.5
2002	9.5
2003	9.6
2004	10
2005	10.1
2006	10
2007	10.1
2008	10.7
2009	11.4
2010	11.2
2011	11.3
2012	10.3
2013	10.1
2014	10.2
2015	10.3
2016	10.6
2017	10.7
2018	10.6
2019	10.5
2020	10.4
2021	10.4
2022	9.7