Year	per 1,000 people
1960	16.6
1961	16.6
1962	16.7
1963	17.6
1964	17.7
1965	18
1966	18.4
1967	16.8
1968	15.3
1969	14.6
1970	14.4
1971	15.2
1972	15.1
1973	14.3
1974	14.1
1975	14.2
1976	12.9
1977	12.2
1978	12.2
1979	11.6
1980	11.2
1981	10.4
1982	10.3
1983	9.9
1984	10.1
1985	10.5
1986	10.8
1987	11
1988	11.5
1989	12
1990	12.3
1991	12.5
1992	13.1
1993	13
1994	13.4
1995	13.3
1996	12.9
1997	12.8
1998	12.5
1999	12.4
2000	12.6
2001	12.2
2002	11.9
2003	12
2004	12
2005	11.9
2006	12
2007	11.7
2008	11.8
2009	11.4
2010	11.4
2011	10.6
2012	10.4
2013	10
2014	10.1
2015	10.2
2016	10.8
2017	10.6
2018	10.6
2019	10.5
2020	10.4
2021	10.8
2022	9.9