Year	per 1,000 people
1960	3.4280791963700303
1970	3.470172873597809
1990	2.4984866132033416
1993	2.5721417504619257
1996	2.2725271021260305
2003	1.828713892103594
2005	2.194701216697073
2006	1.9054824886316242
2007	1.7620384040951682
2008	1.8795964623285255
2009	1.8453626622576655
2010	2.0258769519025344
2011	1.923675518618586
2012	1.9733779254537387
2013	1.9982672337690757
2014	1.9168750387278806
2015	1.8877198461497626
2016	1.9156432716799885
2017	1.900128242627605