Year	per 1,000 people
1960	23.1
1961	21.3
1962	20.6
1963	22
1964	20.6
1965	20.6
1966	18.9
1967	20.4
1968	20.7
1969	19.9
1970	20
1971	16.2
1972	16.2
1973	17.7
1974	13.9
1975	12.8
1976	14.4
1977	12.6
1978	12.5
1979	14.5
1980	15.4
1981	14.4
1982	14.6
1983	13.2
1984	15.2
1985	13.9
1986	12.9
1987	13.2
1988	14.9
1989	13.2
1990	13.2
1991	14.2
1992	12.7
1993	13.8
1994	11.7
1995	13.8
1996	13.1
1997	13.9
1998	12.6
1999	12.4
2000	12.9
2001	12.1
2002	11.7
2003	10.2
2004	10.8
2005	11
2006	10.3
2007	10
2008	9.9
2009	11.4
2010	9.1
2011	10.9
2012	9.7
2013	9.2
2014	10
2015	8.7
2016	10
2017	8.9
2018	9.9
2019	9.2
2020	9.1
2021	9.6
2022	9.2