Year	per 1,000 people
1960	5.7
1961	5.8
1962	6
1963	6.1
1964	6.3
1965	6.3
1966	6.3
1967	6.4
1968	6.7
1969	6.9
1970	7.1
1971	7
1972	7.2
1973	7
1974	7.1
1975	7.1
1976	6.7
1977	6.9
1978	6.8
1979	6.7
1980	6.7
1981	6.5
1982	6.9
1983	6.9
1984	6.7
1985	6.6
1986	6.8
1987	6.7
1988	6.6
1989	7.1
1990	6.8
1991	6.5
1992	6.4
1993	6.6
1994	6.5
1995	6.3
1996	6.1
1997	6.2
1998	6.2
1999	6.1
2000	6
2001	5.8
2002	5.8
2003	5.8
2004	5.6
2005	5.6
2006	5.5
2007	5.6
2008	5.4
2009	5.2
2010	5.2
2011	5.3
2012	5.3
2013	5.2
2014	5.2
2015	5.3
2016	5.2
2017	5.2
2018	5
2019	5.1
2020	5.3
2021	5.4
2022	5.4