Year	per 1,000 people
1960	10.1
1961	9.3
1962	8.5
1963	8.6
1964	8.6
1965	8.7
1966	9.45
1967	10.2
1968	9.9
1969	9.6
1970	9.3
1971	9.4
1972	7.8
1973	7.8
1974	7.9
1975	7
1976	7.8
1977	6.7
1978	6.6
1979	6.9
1980	7.2
1981	6.4
1982	6.3
1983	5.7
1984	6
1985	5.8
1986	5.7
1987	5.7
1988	5.9
1989	5.9
1990	5.4
1991	5.6
1992	5.2
1993	5.2
1994	5.6
1995	5.3
1996	5.2
1997	5
1998	4.8
1999	5.2
2000	5.1
2001	5.2
2002	5.1
2003	5
2004	4.9
2005	4.9
2006	4.7
2007	5
2008	4.8
2009	5.1
2010	4.8
2011	5.2
2012	5.1
2013	5.2
2014	5.2
2015	5.4
2016	5.8
2017	5.7
2018	5.7
2019	6
2020	5.7
2021	7.3
2022	7.1