Year	per 1,000 people
1960	6.2
1961	5.9
1962	5.8
1963	5.6
1964	5.7
1965	5.4
1966	5.4
1967	5.3
1968	5.5
1969	5
1970	5.2
1971	5.4
1972	5.4
1973	5.4
1974	5.2
1975	5.1
1976	5.1
1977	5.1
1978	5.1
1979	5.2
1980	4.9
1981	4.9
1982	4.9
1983	5
1984	4.8
1985	4.9
1986	4.6
1987	4.7
1988	4.9
1989	4.9
1990	4.7
1991	4.6
1992	4.7
1993	4.6
1994	4.7
1995	4.8
1996	4.7
1997	4.5
1998	4.6
1999	4.5
2000	4.5
2001	4.3
2002	4.4
2003	4.5
2004	4.4
2005	4.4
2006	4.4
2007	4.5
2008	4.4
2009	4.3
2010	4.4
2011	4.5
2012	4.5
2013	4.6
2014	4.7
2015	4.8
2016	4.8
2017	5
2018	5
2019	5
2020	5.2
2021	5.8
2022	6.3