Year	per 1,000 people
1960	34
1961	33.2
1962	32.4
1963	33.1
1964	33.8
1965	34.5
1966	34.95
1967	35.4
1968	35.3
1969	35.1
1970	35
1971	34.8
1972	34.6
1973	33.3
1974	32
1975	31.1
1976	29
1977	28.8
1978	26.4
1979	26.3
1980	26.2
1981	27.7
1982	26.3
1983	25.8
1984	24.8
1985	23.4
1986	24.9
1987	25.7
1988	24.7
1989	23.6
1990	25.6
1991	25.7
1992	24.5
1993	23.5
1994	22.5
1995	21.9
1996	22.3
1997	22.3
1998	21.2
1999	20.6
2000	21.4
2001	19.9
2002	18.9
2003	18.2
2004	17.4
2005	17.4
2006	17.9
2007	17.1
2008	16.5
2009	16.7
2010	16.7
2011	16.2
2012	16.9
2013	16.6
2014	16.3
2015	15.6
2016	15.8
2017	15
2018	15
2019	15.2
2020	14.7
2021	14.5
2022	14.1