Year	per 1,000 people
1960	17.6
1961	18.2
1962	18.1
1963	18
1964	17.9
1965	18.5
1966	18.5
1967	17.7
1968	16.8
1969	16.3
1970	15.9
1971	16.3
1972	16.4
1973	16.7
1974	16.1
1975	16.6
1976	16.7
1977	16.2
1978	16.3
1979	16.3
1980	15.7
1981	15.3
1982	15.1
1983	14.1
1984	13.6
1985	13.4
1986	13
1987	12.9
1988	12.6
1989	11.7
1990	11.2
1991	10.8
1992	10
1993	9.9
1994	9.8
1995	9.5
1996	9.4
1997	9.1
1998	9
1999	8.8
2000	9.1
2001	8.8
2002	8.8
2003	8.7
2004	9
2005	9.1
2006	9.4
2007	9.8
2008	10.8
2009	10.7
2010	10.9
2011	10.7
2012	10.7
2013	10.2
2014	10.3
2015	10
2016	9.9
2017	9.8
2018	9.4
2019	9.3
2020	8.9
2021	9
2022	8.3