Year	per 1,000 people
1960	40.432
1961	39.7
1962	38.8
1963	40.4
1964	38.9
1965	36
1966	36
1967	31
1968	31.6
1969	27.7
1970	27.5
1971	26.1
1972	25.3
1973	23
1974	27.3
1975	25.3
1976	25.8
1977	26
1978	27.1
1979	27.5
1980	27.2
1981	25.5
1982	22.6
1983	21
1984	20.1
1985	19
1986	18.6
1987	19.3
1988	20.1
1989	20.8
1990	21.3
1991	20.7
1992	21.1
1993	20.3
1994	19.6
1995	18.3
1996	18.3
1997	17.4
1998	16.7
1999	17.3
2000	17
2001	16.5
2002	16.6
2003	15.9
2004	15.7
2005	15.3
2006	14.3
2007	13.7
2008	13.2
2009	12.3
2010	12
2011	11.7
2012	11.5
2013	10.9
2014	10.6
2015	10.1
2016	10.4
2017	10.7
2018	10.2
2019	10.2
2020	10.6
2021	10.3
2022	9.6