Year	per 1,000 people
1970	1.3770684783812488
1975	1.544343247785714
1980	1.9672711380694048
1981	1.9545378215896543
1985	2.094409193744518
1990	2.4155983736869793
1991	2.072771286670631
2000	1.6145781288321528
2001	1.5127547404423358
2002	1.523160270309475
2003	1.6417009498237076
2005	1.5157955636829592
2006	1.5578752101464437
2007	1.5614372334426274
2008	1.5851059217755892
2009	1.6047084223308414
2010	1.7364306885516034
2011	1.8003377925405415
2012	1.8955515733535155
2013	1.936243499340771
2014	1.9452317467731517
2015	1.8659515096307107
2016	1.912911555837466
2017	2.090346433153642