Year	per 1,000 people
1960	32.4
1961	31.4
1962	31.3
1963	31
1964	31
1965	30.7
1966	28.9
1967	26.7
1968	25.5
1969	24.9
1970	24.8
1971	25.6
1972	24
1973	23.3
1974	24.3
1975	23.8
1976	24.2
1977	24.5
1978	24.1
1979	23.4
1980	22.8
1981	22
1982	21.05
1983	20.1
1984	19.3
1985	19.4
1986	19.45
1987	19.5
1988	19.3
1989	19.1
1990	18.5
1991	18.1
1992	17.8
1993	17.9
1994	17.5
1995	17
1996	16.9
1997	16.2
1998	15.7
1999	15.6
2000	15.59
2001	14.59
2002	13.7
2003	13.1
2004	13.16
2005	12.96
2006	12.41
2007	11.86
2008	11.79
2009	11.72
2010	11.3
2011	11.1
2012	10.6
2013	10.1
2014	9.7
2015	9
2016	8.3
2017	7.3
2018	6.7
2019	6.4
2020	6
2021	5.9
2022	5.9