Year	per 1,000 people
1960	24.1
1961	24.4
1962	24.5
1963	23.5
1964	24
1965	23.4
1966	23.2
1967	22.8
1968	22.1
1969	21.7
1970	20.8
1971	21
1972	20.2
1973	20
1974	19.6
1975	19.8
1976	20
1977	19.1
1978	17.5
1979	16.6
1980	16.2
1981	15.4
1982	15.2
1983	14.5
1984	14.3
1985	13
1986	12.6
1987	12.3
1988	12.2
1989	11.8
1990	11.7
1991	11.7
1992	11.5
1993	11.4
1994	10.9
1995	10.7
1996	11
1997	11.2
1998	11.2
1999	11.4
2000	11.7
2001	10.9
2002	11
2003	10.8
2004	10.4
2005	10.4
2006	10
2007	9.7
2008	9.9
2009	9.4
2010	9.6
2011	9.2
2012	8.5
2013	7.9
2014	7.9
2015	8.3
2016	8.4
2017	8.4
2018	8.5
2019	8.4
2020	8.2
2021	7.7
2022	8