Year	per 1,000 people
1960	9.1
1961	9.2
1962	9.4
1963	10
1964	9.5
1965	9.4
1966	9.6
1967	9.6
1968	9.9
1969	10.1
1970	10
1971	10
1972	10
1973	10.1
1974	9.9
1975	10
1976	10
1977	9.8
1978	10
1979	10.2
1980	10.1
1981	10.2
1982	10.1
1983	10.2
1984	10.3
1985	10.7
1986	10.5
1987	10.7
1988	10.8
1989	10.7
1990	10.9
1991	10.5
1992	10.4
1993	10.8
1994	10.2
1995	10.4
1996	10
1997	10.1
1998	10
1999	10.1
2000	9.8
2001	9.7
2002	9.8
2003	9.3
2004	9
2005	8.9
2006	8.9
2007	8.9
2008	8.7
2009	8.6
2010	8.5
2011	8.4
2012	8.4
2013	8.1
2014	7.9
2015	7.8
2016	7.8
2017	7.7
2018	7.7
2019	7.6
2020	7.5
2021	7.8
2022	8.4