Year	per 1,000 people
1960	9.8
1961	9.9
1962	10.8
1963	10.4
1964	10.5
1965	10.7
1966	10.8
1967	11.1
1968	11.7
1969	12.2
1970	12.5
1971	12.5
1972	12.1
1973	12.5
1974	12.7
1975	12.4
1976	12.4
1977	12.4
1978	12.4
1979	12.4
1980	13.2
1981	12.7
1982	12.7
1983	13
1984	12.8
1985	12.7
1986	12.8
1987	12.3
1988	12.1
1989	12.3
1990	12.5
1991	12.1
1992	11.7
1993	11.4
1994	11.4
1995	11.4
1996	10.9
1997	10.9
1998	10.6
1999	10.7
2000	10.6
2001	10.5
2002	10.6
2003	10.9
2004	10.5
2005	10.6
2006	10.2
2007	10.2
2008	10.1
2009	10.3
2010	10.2
2011	10.2
2012	10.3
2013	10.4
2014	10
2015	10.5
2016	10.2
2017	10.5
2018	10.6
2019	10.5
2020	12.1
2021	13.3
2022	11.3