Year	per 1,000 people
1960	9.8
1961	9.4
1962	9.9
1963	10
1964	9.3
1965	9.5
1966	9.4
1967	9.2
1968	9.5
1969	9.5
1970	9.2
1971	9.3
1972	9
1973	9
1974	8.9
1975	8.8
1976	9.1
1977	8.9
1978	9.2
1979	9.1
1980	9.4
1981	9.4
1982	9.3
1983	9.5
1984	9.1
1985	9.2
1986	9.2
1987	9.3
1988	9
1989	9.2
1990	9.5
1991	9.2
1992	9.1
1993	9
1994	8.9
1995	9
1996	8.9
1997	8.9
1998	8.8
1999	8.7
2000	8.7
2001	8.5
2002	8.5
2003	8.6
2004	8.1
2005	8.2
2006	8.1
2007	8.1
2008	8
2009	8.1
2010	8
2011	7.8
2012	8
2013	8
2014	7.8
2015	8.2
2016	7.8
2017	7.9
2018	7.9
2019	7.9
2020	8.8
2021	8.2
2022	8.5