Year	per 1,000 people
1960	10
1961	10.1
1962	10.8
1963	10.3
1964	9.4
1965	10.1
1966	10.2
1967	10.6
1968	10.8
1969	11.2
1970	11.3
1971	11.1
1972	11.4
1973	11.6
1974	11.5
1975	12.2
1976	12.3
1977	12.4
1978	12.5
1979	12.8
1980	12.8
1981	12.7
1982	12.3
1983	12.7
1984	13
1985	13.2
1986	12
1987	12.2
1988	12.2
1989	12.2
1990	13.1
1991	13.1
1992	13.5
1993	15.3
1994	16.6
1995	15.7
1996	14
1997	13.8
1998	14.2
1999	13.7
2000	13.6
2001	14.1
2002	14.1
2003	14.2
2004	14.2
2005	14.6
2006	14.9
2007	15
2008	14.2
2009	14
2010	14.3
2011	13.9
2012	14.3
2013	14.3
2014	14.3
2015	14.4
2016	14.6
2017	14.8
2018	15
2019	14.5
2020	15.2
2021	18.4
2022	16.4