Year	per 1,000 people
1970	1.4359363239966176
1975	1.5458064020278224
1980	2.09878508900347
1985	2.8163689381468737
1990	2.9974682431003865
1991	2.6803290163072804
2000	2.074423764503519
2001	1.9320281814592555
2002	1.8606983321317623
2003	2.0866740433658073
2005	1.904379983213689
2006	1.9470276601299317
2007	1.9484812910049516
2008	1.9340240040314034
2009	1.9268318702171772
2010	1.9535074466539022
2011	2.0831222179702813
2012	2.12668097070298
2013	2.2234269940383617
2014	2.2007611580714315
2015	2.1146401423613956
2016	2.155213116040145
2017	2.328294478277217