Year	per 1,000 people
1960	8.1
1961	7.9
1962	8.7
1963	8.2
1964	7.9
1965	8.2
1966	8.3
1967	9
1968	8.6
1969	9.5
1970	9.1
1971	9.7
1972	9.8
1973	9.5
1974	9.8
1975	10.3
1976	10.1
1977	10.7
1978	10.5
1979	10.7
1980	11.1
1981	10.7
1982	11.2
1983	11.4
1984	11.3
1985	12
1986	11.6
1987	12
1988	12
1989	12
1990	12.5
1991	12.8
1992	12.6
1993	12.9
1994	13.2
1995	13.6
1996	14
1997	14.7
1998	14.3
1999	13.6
2000	14.1
2001	14
2002	14.4
2003	14.4
2004	14.3
2005	14.8
2006	14.9
2007	15
2008	14.8
2009	14.5
2010	14.9
2011	14.7
2012	15
2013	14.4
2014	15.1
2015	15.3
2016	15.1
2017	15.5
2018	15.4
2019	15.5
2020	18
2021	21.7
2022	18.4