Year	per 1,000 people
1960	26.9
1961	25.1
1962	24.9
1963	25
1964	25.7
1965	25.8
1966	25.5
1967	23.7
1968	24.9
1969	25.6
1970	26.1
1971	28
1972	27.2
1973	27
1974	27.5
1975	27.6
1976	27.9
1977	26.3
1978	25
1979	24.7
1980	24.3
1981	23.6
1982	24
1983	24
1984	23.7
1985	23.5
1986	23.1
1987	22.7
1988	22.6
1989	22.3
1990	22.2
1991	21.4
1992	21.5
1993	21.3
1994	21.2
1995	21.1
1996	21.3
1997	21.4
1998	21.9
1999	21.5
2000	21.7
2001	21.2
2002	21.2
2003	21.7
2004	21.3
2005	20.8
2006	21
2007	21.1
2008	21.5
2009	21.5
2010	21.8
2011	21.4
2012	21.6
2013	21.3
2014	21.5
2015	21.3
2016	21.2
2017	21.1
2018	20.8
2019	20.1
2020	19.2
2021	19.7
2022	19