Year	per 1,000 people
1960	16.28
1961	15.921
1962	15.443
1963	14.939
1964	14.504
1965	14.053
1966	13.486
1967	13.097
1968	12.678
1969	12.338
1970	12.038
1971	11.794
1972	11.568
1973	11.275
1974	11
1975	10.891
1976	10.767
1977	10.544
1978	10.344
1979	10.094
1980	9.917
1981	9.81
1982	9.7
1983	9.469
1984	9.416
1985	9.213
1986	9.161
1987	9.054
1988	8.941
1989	7.2
1990	6.9
1991	6.9
1992	7.1
1993	7.6
1994	8.2
1995	8
1996	7.4
1997	7.3
1998	7.2
1999	6.8
2000	7
2001	6.6
2002	7.1
2003	7.1
2004	6.9
2005	7.2
2006	7.4
2007	7.2
2008	7.1
2009	6.7
2010	6.6
2011	6.5
2012	6.5
2013	6.1
2014	6.1
2015	5.8
2016	5.5
2017	5.4
2018	5.2
2019	5.2
2020	6.1
2021	5.8
2022	4.5