Year	per 1,000 people
1960	17.8
1961	17.4
1962	16.7
1963	16.4
1964	16.1
1965	15.3
1966	14.9
1967	15
1968	16.9
1969	17
1970	16.3
1971	15.9
1972	15.3
1973	16.2
1974	17.2
1975	16.6
1976	16.5
1977	16.1
1978	15.5
1979	15.3
1980	14.5
1981	14
1982	13.9
1983	13.8
1984	13.6
1985	13.3
1986	13.4
1987	13
1988	13.1
1989	12.6
1990	12.1
1991	11.1
1992	10.4
1993	10
1994	9.4
1995	8.6
1996	8.6
1997	7.7
1998	7.9
1999	8.8
2000	9
2001	8.5
2002	8.5
2003	8.7
2004	9.1
2005	9.3
2006	9.7
2007	10
2008	10.4
2009	10.9
2010	10.2
2011	9.6
2012	9.5
2013	9.2
2014	9.4
2015	9.2
2016	9.1
2017	9
2018	8.9
2019	8.8
2020	8.5
2021	8.5
2022	8.8