Year	per 1,000 people
1960	19.1
1961	17.5
1962	16.2
1963	15.7
1964	15.2
1965	14.6
1966	14.2
1967	27
1968	26.6
1969	23.3
1970	21.1
1971	19.6
1972	18.8
1973	18.2
1974	20.3
1975	19.6
1976	19.4
1977	19.5
1978	19
1979	18.6
1980	18
1981	17
1982	15.3
1983	14.3
1984	15.5
1985	15.8
1986	16.5
1987	16.7
1988	16.5
1989	16
1990	13.6
1991	12
1992	11.4
1993	11
1994	10.9
1995	10.4
1996	10.2
1997	10.5
1998	10.5
1999	10.4
2000	10.4
2001	10
2002	9.7
2003	9.8
2004	10.1
2005	10.4
2006	10.4
2007	10.3
2008	10.8
2009	10.9
2010	10.5
2011	9.7
2012	10
2013	9.4
2014	10
2015	10.2
2016	10.4
2017	10.8
2018	10.4
2019	10.3
2020	10.3
2021	10.1
2022	9.6