Year	per 1,000 people
1960	7.8
1961	7.5
1962	8.1
1963	7.7
1964	7.6
1965	8.2
1966	8.2
1967	8
1968	8.5
1969	9
1970	9.3
1971	9.4
1972	9
1973	9.4
1974	9.6
1975	9.5
1976	9.5
1977	9.7
1978	9.8
1979	9.7
1980	10.2
1981	9.9
1982	10
1983	10.3
1984	10.1
1985	10.2
1986	10.2
1987	10
1988	10
1989	10.2
1990	10.3
1991	10.3
1992	10.1
1993	9.9
1994	9.6
1995	9.8
1996	9.5
1997	9.7
1998	9.9
1999	9.7
2000	9.8
2001	9.7
2002	9.6
2003	9.7
2004	9.7
2005	10
2006	9.9
2007	10
2008	9.9
2009	9.8
2010	9.9
2011	9.6
2012	9.7
2013	9.6
2014	9.5
2015	9.9
2016	9.6
2017	9.9
2018	10
2019	9.8
2020	10.8
2021	13.5
2022	11