Year	per 1,000 people
1960	21.7
1961	21.2
1962	21.1
1963	21.4
1964	22
1965	21.1
1966	20.7
1967	20.7
1968	20.1
1969	19.9
1970	19.5
1971	19.6
1972	19.4
1973	19.2
1974	19.5
1975	18.7
1976	18.7
1977	18
1978	17.3
1979	16.2
1980	15.2
1981	14.1
1982	13.6
1983	12.7
1984	12.3
1985	11.9
1986	11.4
1987	11
1988	10.8
1989	10.5
1990	10.3
1991	10.2
1992	10.1
1993	9.8
1994	9.4
1995	9.1
1996	9.1
1997	9.2
1998	9.1
1999	9.4
2000	9.8
2001	9.9
2002	10.1
2003	10.4
2004	10.6
2005	10.6
2006	10.8
2007	10.9
2008	11.3
2009	10.6
2010	10.4
2011	10.1
2012	9.7
2013	9.1
2014	9.2
2015	9
2016	8.8
2017	8.4
2018	7.9
2019	7.6
2020	7.2
2021	7.1
2022	6.9