Year	per 1,000 people
1960	1.1
1961	1.1
1962	1.1
1963	1.1
1964	1.1
1965	1.2
1966	1.2
1967	1.2
1968	1.2
1969	1.2
1970	1.2
1971	1.3
1972	1.4
1973	1.4
1974	1.5
1975	1.6
1976	1.7
1977	1.7
1978	1.8
1979	1.8
1990	2.507
1991	2.597
1999	2.38
2000	2.447
2001	2.525
2002	2.59
2003	2.632
2004	2.662
2005	2.717
2006	2.799
2007	2.792
2008	2.868
2009	2.922
2010	2.963
2011	3.131
2012	3.248
2013	3.301
2014	3.407
2015	3.471
2016	3.517
2017	3.588
2018	3.661
2019	3.751
2020	3.836