Year	per 1,000 people
1960	12.31
1961	9.8
1962	9.3
1963	9.7
1964	8.7
1965	8.8
1966	9
1967	8.6
1968	9.2
1969	8.3
1970	7.9
1971	7.7
1972	7.9
1973	7.8
1974	7.3
1975	8.1
1976	7.7
1977	7.8
1978	7.1
1979	7.2
1980	7.2
1981	6.8
1982	6.6
1983	6.5
1984	6.6
1985	6.8
1986	6.6
1987	6.5
1988	6.6
1989	6.8
1990	6.6
1991	6.6
1992	6.5
1993	6.8
1994	6.7
1995	6.7
1996	6.8
1997	7
1998	6.8
1999	6.8
2000	6.7
2001	6.7
2002	6.9
2003	7
2004	6.9
2005	7
2006	7.4
2007	6.9
2008	7.2
2009	7.4
2010	7.3
2011	7.3
2012	7.4
2013	7.5
2014	7.7
2015	7.7
2016	8.1
2017	8
2018	8.5
2019	8.8
2020	8.7
2021	10.5
2022	10.2