Year	per 1,000 people
1980	8.412177718879468
1985	8.842912069643024
1990	7.365760030908733
1991	7.480359109216484
1992	7.132345882507903
1993	7.884858729211373
1994	7.91257259898478
1995	7.748207312482339
1996	7.498552352895382
1997	7.340360531752851
1998	7.276602134960361
1999	7.124419675009671
2000	6.7811090236024265
2001	6.815683303971438
2002	6.601213901411287
2003	6.506075165989614
2004	6.463647347007624
2005	6.3486584535938295
2006	6.27955310769381
2007	6.246258548964784
2008	6.071901646795014
2009	5.98771559039264
2010	5.885311690986148
2011	5.843087425206951
2012	5.8351152561504
2013	5.758183180806723
2014	5.768733719544468
2015	5.611798391832671
2016	5.565847441615352
2017	5.599475540766458