Year	per 1,000 people
1960	9
1961	9.1
1962	9.5
1963	9.3
1964	9.3
1965	9.7
1966	9.5
1967	9.5
1968	9.7
1969	9.9
1970	9.6
1971	9.9
1972	9.5
1973	9.3
1974	9.5
1975	9.3
1976	9.5
1977	9.3
1978	9.2
1979	9.2
1980	9.3
1981	9.3
1982	9
1983	9.3
1984	9.2
1985	9.8
1986	9.6
1987	9.7
1988	9.9
1989	9.9
1990	10
1991	9.8
1992	9.9
1993	10.1
1994	9.4
1995	9.6
1996	9.6
1997	9.6
1998	9.6
1999	9.6
2000	9.5
2001	9.4
2002	9.5
2003	9.4
2004	9.1
2005	9.1
2006	9.1
2007	9.3
2008	9.2
2009	9.3
2010	9.5
2011	9.4
2012	9.6
2013	9.5
2014	9.6
2015	9.6
2016	9.8
2017	9.8
2018	9.9
2019	9.8
2020	10
2021	10.4
2022	11.4