Year	per 1,000 people
1980	3.362
1985	3.799
1986	3.877
1987	3.906
1988	3.964
1989	3.99
1990	3.701
1991	3.732
1992	3.687
1993	3.724
1994	3.684
1995	3.703
1996	3.673
1997	3.609
1998	3.541
1999	3.516
2000	3.545
2001	3.512
2002	3.521
2003	3.508
2004	3.512
2005	3.533
2006	3.511
2007	3.648
2008	3.612
2009	3.596
2010	3.582
2011	3.359
2012	3.409
2013	3.373
2014	3.362
2015	3.291
2016	3.227
2017	3.164
2018	3.2
2019	3.111