Year	per 1,000 people
1960	6.7
1961	6.8
1962	6.8
1963	7
1964	7.3
1965	6.8
1966	6.7
1967	6.3
1968	6.5
1969	6.5
1970	6.7
1971	6.5
1972	6.6
1973	6.5
1974	6.7
1975	6.5
1976	6.6
1977	6.4
1978	6.3
1979	6.4
1980	6.4
1981	6.5
1982	6.5
1983	6.5
1984	6.6
1985	7.1
1986	7.2
1987	7.3
1988	7.35
1989	7.4
1990	7.3
1991	7.4
1992	7.6
1993	7.8
1994	7.7
1995	8.1
1996	8
1997	7.7
1998	7.8
1999	7.7
2000	7.48
2001	7.5
2002	7.28
2003	7.31
2004	7.46
2005	7.6
2006	7.29
2007	7.44
2008	7.61
2009	7.78
2010	7.833
2011	8
2012	8.1
2013	8.1
2014	8.5
2015	8.084
2016	8.86
2017	9.222
2018	9.063
2019	9.194
2020	10.131
2021	10.2
2022	11