Year	per 1,000 people
1965	1.07
1966	0.96
1967	0.94
1968	0.91
1969	0.88
1970	0.86
1971	0.85
1972	0.86
1973	0.89
1974	0.92
1975	0.96
1976	1
1977	1.03
1979	1.12
1981	1.25
1982	1.3
1983	1.32
1984	1.33
1986	1.35
1987	1.37
1988	1.47
1989	1.54
1990	1.129
1995	1.194
1996	1.201
1997	1.216
1998	1.214
1999	1.244
2000	1.268
2001	1.287
2002	1.143
2003	1.19
2004	1.22
2005	1.244
2006	1.278
2007	1.298
2008	1.347
2009	1.423
2010	1.463
2011	1.489
2012	1.565
2013	1.661
2014	1.715
2015	1.8
2016	1.891
2017	2.006
2018	2.124
2019	2.258
2020	2.387