Year	per 1,000 people
1971	8.5
1972	9.4
1973	8.3
1974	8.6
1975	7.3
1976	7.7
1977	7.7
1978	7.5
1979	7
1980	7
1981	6.9
1982	7.5
1983	7
1984	7.5
1985	7.2
1986	7.6
1987	7.4
1988	7.3
1989	8.1
1990	7.7
1991	7.7
1992	7.4
1993	8.3
1994	7.6
1995	7
1996	7.4
1997	7.8
1998	7.2
1999	7
2000	6.8
2001	6.8
2002	7.7
2003	8.1
2004	7.2
2005	8.1
2006	7.8
2007	7.4
2008	7.6
2009	7.8
2010	7.4
2011	7.9
2012	7.4
2013	8
2014	7.9
2015	7.5
2016	7.9
2017	7.8
2018	8.4
2019	8.1
2020	6.8
2021	9.3
2022	7.8