Year	per 1,000 people
1980	9.148496232755535
1985	9.586293303720264
1986	9.670883357437049
1987	9.653123694031336
1988	9.62171373263942
1989	9.562699439617527
1990	9.159717402805667
1991	9.022345264680002
1992	8.692870286097884
1993	8.516420964737833
1994	8.319818286090378
1995	8.124053960082959
1996	7.898554823422043
1997	7.538128196249892
1998	7.292636718467002
1999	7.08817320511574
2000	7.007940701716992
2001	7.0008808207830535
2002	6.857777648202158
2003	6.781846877285435
2004	6.703530148157472
2005	6.611760818690126
2006	6.522670134440844
2007	6.411071917948427
2008	6.232394660200833
2009	6.164990402556916
2010	6.020810892119358
2011	5.9438156545888905
2012	5.901933837326411
2013	5.782307116400127
2014	5.679069248711105
2015	5.468540272936514
2016	5.41263881061678
2017	5.366644269383897
2018	4.7195268595753115