Year	per 1,000 people
1960	5.63686955703445
1970	5.82912912530547
1990	5.443400805725274
1993	3.4892858304707532
1995	3.7943742668933003
1996	4.040873048808178
2001	3.321597264551395
2005	3.4067792965117265
2006	3.108815313171608
2007	2.462055210865088
2009	2.764398851914891
2014	2.6295961412421303
2017	2.9194698871043547