Year	per 1,000 people
1960	22.6
1961	20.9
1962	19.8
1963	19.2
1964	18.1
1965	17.4
1966	16.8
1967	16.3
1968	16.3
1969	16.4
1970	16.8
1971	17.2
1972	17.5
1973	18
1974	18.5
1975	19
1976	19.6
1977	19.2
1978	19.1
1979	19.6
1980	19.6
1981	19
1982	19.5
1983	19.8
1984	19
1985	18.3
1986	17
1987	16.1
1988	15.6
1989	14.9
1990	14.4
1991	14.3
1992	13.4
1993	12.9
1994	12.5
1995	11.2
1996	11.1
1997	10.7
1998	10.2
1999	9.9
2000	9.9
2001	9.6
2002	9.3
2003	9.2
2004	9.3
2005	9.5
2006	9.8
2007	10.2
2008	10.9
2009	10.9
2010	10.9
2011	10.2
2012	10.1
2013	9.7
2014	9.9
2015	9.7
2016	10.1
2017	10.6
2018	10.2
2019	9.9
2020	9.4
2021	8.8
2022	8.3