Year	per 1,000 people
1980	8.030245210707424
1985	8.200495090389499
1990	8.11984050401736
1991	8.038828764744354
1992	7.672285756734745
1993	7.6428860583175275
1994	7.630671596764453
1995	7.238688699559427
1996	7.268246556785571
1997	7.023065449365303
1998	6.797328838809102
1999	6.616530678696343
2000	6.696352284669845
2002	6.73782324654835
2003	6.887874263439732
2004	6.82750990137317
2005	6.774348965948001
2006	6.733956695692899
2007	6.603310898512479
2008	6.664636914463714
2009	6.6548091499585285
2010	6.569159913671758
2011	6.542458717881322
2012	6.574336637522964
2013	6.5563545475166904
2014	6.582222726985893
2015	6.579650169673238
2016	6.583020917725157
2017	6.593183614869361
2018	6.422667075330263