Year	per 1,000 people
1960	37.5
1961	35.2
1962	33.7
1963	33.2
1964	31.6
1965	29.5
1966	28.3
1967	25.6
1968	23.5
1969	21.8
1970	22.1
1971	22.3
1972	23.1
1973	22
1974	19.4
1975	17.7
1976	18.7
1977	16.5
1978	16.8
1979	17.1
1980	17.6
1981	17.6
1982	17.5
1983	16.3
1984	16.5
1985	16.6
1986	14.8
1987	16.6
1988	19.8
1989	17.5
1990	18.2
1991	17.1
1992	16.8
1993	16.8
1994	16.2
1995	15.6
1996	15.2
1997	14.5
1998	13.1
1999	12.8
2000	13.7
2001	11.8
2002	11.4
2003	10.5
2004	10.3
2005	10.2
2006	10.3
2007	10.3
2008	10.2
2009	9.9
2010	9.3
2011	9.5
2012	10.1
2013	9.3
2014	9.8
2015	9.7
2016	9.4
2017	8.9
2018	8.8
2019	8.8
2020	8.5
2021	8.6
2022	7.9