Year	per 1,000 people
1960	1.5
1961	1.6
1962	1.7
1963	1.7
1964	1.8
1965	1.9
1966	1.9
1967	2
1968	1.9
1969	2
1970	2
1971	2.1
1972	2.1
1973	2.2
1974	2.2
1975	2.2
1976	2.3
1977	2.3
1978	2.4
1979	2.5
1980	2.3
1981	2.3
1982	2.4
1983	2.4
1984	2.5
1985	2.5
1986	2.6
1987	2.7
1988	2.7
1989	2.7
1990	2.942
1991	3.029
1992	3.007
1993	2.955
1994	2.996
1995	3.004
1996	3.041
1997	3.077
1998	3.083
1999	3.106
2000	2.685
2001	2.893
2002	3.198
2003	3.251
2004	3.341
2005	2.785
2006	3.04
2007	2.807
2008	3.095
2009	3.025
2010	2.872
2011	2.964
2012	3.088
2013	3.209
2014	3.323
2015	3.097
2016	3.211
2017	3.325
2018	3.384
2019	3.493
2020	3.139
2021	3.291