Year	per 1,000 people
1970	9.651597471460292
1980	9.896786013407763
1985	9.04895832392628
1990	8.227244379737305
1991	8.008218881776132
1992	7.883251803305434
1993	7.725060408002853
1994	7.62338006703287
1995	7.490374501366592
1996	7.4831517848061315
1997	7.21768567599706
1998	7.059300591923113
1999	6.866292528169187
2000	6.647760397020771
2001	6.531576433307445
2002	6.40526169030847
2003	6.257862642092686
2004	6.131287422457309
2005	6.0442133137096095
2006	5.944900433021839
2007	5.88501653738484
2008	5.794961875941578
2009	5.677406221223429
2010	5.578860048036132
2011	5.53280286486721
2012	5.482831620554228
2013	5.404030196352056
2014	5.439005919539518
2015	5.306884279959985
2016	5.256766565086802
2017	5.207773732178463
2018	4.277508935927924