Year	per 1,000 people
1960	21.5
1961	21.2
1962	21.8
1963	22.2
1964	22.4
1965	22.1
1966	21.5
1967	21.1
1968	20.9
1969	21.5
1970	21.8
1971	22.6
1972	22.6
1973	22.3
1974	22
1975	21.1
1976	20.9
1977	21
1978	21.1
1979	21.5
1980	21.7
1981	20.9
1982	20.3
1983	19.1
1984	18.1
1985	17.6
1986	17.4
1987	16.5
1988	15.5
1989	14.8
1990	15.1
1991	14.9
1992	14.4
1993	13.8
1994	13.4
1995	13.5
1996	13.9
1997	14.4
1998	14.5
1999	14.4
2000	14.4
2001	15
2002	15.4
2003	15.4
2004	15.2
2005	14.8
2006	15.3
2007	16.2
2008	16.7
2009	16.7
2010	16.5
2011	16.2
2012	15.6
2013	14.9
2014	14.4
2015	13.9
2016	13.4
2017	12.9
2018	12.5
2019	12
2020	11.2
2021	12
2022	11.2