Year	per 1,000 people
1960	9.286076388157062
1970	9.436792618521698
1980	8.970875676252277
1985	8.683759995364236
1990	7.0234634309694925
1991	7.03844055899123
1992	6.7389824599125365
1993	7.7621405700305175
1994	7.742115612622867
1995	7.488957053703838
1996	7.28082081682659
1997	7.087623926005917
1998	6.920607249170537
1999	6.778226826709402
2000	6.515925167423708
2001	6.409175735839356
2002	6.341825025454546
2003	6.213560501165523
2004	6.159715244476777
2005	6.067216513631974
2006	6.019865047076346
2007	6.023787787532015
2008	5.942645253452106
2009	5.917984860080813
2010	5.86789617543471
2011	5.793552962248268
2012	5.801290041239634
2013	5.734178163632896
2014	5.680860540690178
2015	5.48186015019558
2016	5.454433730386856
2017	5.501580430076378