Year	per 1,000 people
1960	16.7
1961	16.5
1962	16.1
1963	15.3
1964	15.4
1965	14.6
1966	14.2
1967	14.2
1968	14.9
1969	15.4
1970	15.8
1971	16.1
1972	15.6
1973	15.1
1974	15.1
1975	14.9
1976	15.1
1977	15.2
1978	15
1979	14.9
1980	15
1981	15.4
1982	15.4
1983	16
1984	16
1985	15.5
1986	15.7
1987	16.2
1988	16
1989	15.5
1990	14.2
1991	12.4
1992	11.8
1993	10.2
1994	9.7
1995	9.4
1996	9.4
1997	9
1998	8.8
1999	9
2000	9.4
2001	9.1
2002	9.4
2003	9.5
2004	10.3
2005	10.6
2006	11
2007	11.8
2008	12
2009	11.8
2010	11.9
2011	11.1
2012	10.6
2013	10.3
2014	10.3
2015	10.6
2016	10.7
2017	10.5
2018	10.9
2019	10.6
2020	9.9
2021	10
2022	8.6