Year	per 1,000 live births
1970	19
1971	18
1972	17
1973	16
1974	15.1
1975	14.2
1976	13.5
1977	12.8
1978	12.3
1979	11.8
1980	11.4
1981	11
1982	10.6
1983	10.2
1984	9.8
1985	9.3
1986	8.9
1987	8.5
1988	8.1
1989	7.8
1990	7.6
1991	7.3
1992	7.1
1993	6.8
1994	6.6
1995	6.3
1996	6
1997	5.7
1998	5.5
1999	5.3
2000	5
2001	4.9
2002	4.7
2003	4.7
2004	4.6
2005	4.5
2006	4.5
2007	4.5
2008	4.5
2009	4.6
2010	4.6
2011	4.5
2012	4.5
2013	4.5
2014	4.4
2015	4.4
2016	4.3
2017	4.2
2018	4.2
2019	4.1
2020	4
2021	3.8
2022	3.7