Year	per 1,000 people
1960	11.8
1961	11.4
1962	12.6
1963	12.1
1964	11.8
1965	12.2
1966	12.1
1967	12.3
1968	12.2
1969	12.4
1970	12.2
1971	12.8
1972	11.9
1973	12
1974	12.2
1975	12.2
1976	12.5
1977	11.3
1978	11.6
1979	11
1980	11.3
1981	11.2
1982	11.3
1983	11.3
1984	11.1
1985	11
1986	10.8
1987	10.8
1988	10.3
1989	10.6
1990	9.9
1991	9.7
1992	10.3
1993	9.8
1994	9.4
1995	9.3
1996	9.4
1997	9.4
1998	9.2
1999	8.8
2000	8.6
2001	8.4
2002	8.4
2003	9
2004	7.8
2005	7.8
2006	8
2007	8.1
2008	7.4
2009	7.3
2010	7.4
2011	7.4
2012	7.3
2013	7
2014	6.9
2015	7
2016	6.8
2017	7.1
2018	7.1
2019	6.9
2020	7.3
2021	7
2022	6.8