Year	per 1,000 people
1960	7.6
1961	7.6
1962	7.9
1963	8
1964	7.7
1965	8
1966	8.1
1967	7.9
1968	8.2
1969	8.4
1970	8.4
1971	8.4
1972	8.5
1973	8.2
1974	8.1
1975	8.3
1976	8.3
1977	7.9
1978	8.2
1979	8
1980	8.1
1981	8.1
1982	8.2
1983	8.2
1984	8.3
1985	8.5
1986	8.6
1987	8.3
1988	8.4
1989	8.7
1990	8.6
1991	8.6
1992	8.6
1993	9
1994	8.7
1995	8.8
1996	8.9
1997	8.7
1998	8.8
1999	8.9
2000	8.8
2001	8.7
2002	8.8
2003	8.7
2004	8.4
2005	8.4
2006	8.3
2007	8.1
2008	8.2
2009	8.1
2010	8.2
2011	8.1
2012	8.4
2013	8.4
2014	8.3
2015	8.7
2016	8.7
2017	8.8
2018	8.9
2019	8.8
2020	9.7
2021	9.8
2022	9.6