Year	per 1,000 people
1960	26.2
1961	23.6
1962	23.2
1963	20.7
1964	19.9
1965	17.7
1966	16.9
1967	17
1968	16.7
1969	16.7
1970	17.6
1971	18.4
1972	17.8
1973	17.4
1974	18
1975	18.8
1976	18.6
1977	18.9
1978	18.2
1979	18.6
1980	17.7
1981	16.6
1982	18.1
1983	17.1
1984	16.9
1985	16.1
1986	15.3
1987	15.4
1988	15.9
1989	15.9
1990	15.2
1991	14.6
1992	14.9
1993	13.9
1994	12.9
1995	12.2
1996	13.3
1997	12.7
1998	12.1
1999	11.4
2000	11.3
2001	10.1
2002	9.9
2003	10.2
2004	9.7
2005	9.6
2006	9.3
2007	9.3
2008	9.8
2009	9.8
2010	9.4
2011	10
2012	9.8
2013	9.5
2014	9.6
2015	9.7
2016	9.8
2017	9.2
2018	9.2
2019	8.6
2020	8.6
2021	8.5
2022	8.1