Year	per 1,000 people
1960	1.3
1961	1.3
1962	1.4
1963	1.4
1964	1.4
1965	1.5
1966	1.5
1967	1.5
1968	1.6
1969	1.6
1971	1.5
1972	1.6
1973	1.7
1974	1.8
1975	1.9
1976	1.9
1977	2
1978	2.1
1979	2.2
1980	2.3
1981	2.4
1982	2.5
1983	2.8
1984	2.7
1985	2.8
1986	2.9
1987	3
1988	3.1
1989	3.2
1990	3.268
1991	3.331
1992	3.401
1993	3.459
1994	3.524
1995	3.558
1996	3.62
1997	3.688
1998	3.74
1999	2.801
2000	2.825
2001	2.842
2002	2.852
2003	2.85
2004	2.859
2005	2.86
2006	2.876
2007	2.897
2008	2.916
2009	2.924
2010	2.925
2011	2.938
2012	2.954
2013	2.972
2014	2.984
2015	3.025
2016	3.078
2017	3.08
2018	3.124
2019	3.157
2020	3.208
2021	6.257