Year	per 1,000 people
1970	1.9592076562929956
1975	2.241007957730109
1980	2.8120637672164257
1981	2.6894058695500234
1985	4.028523261287343
1986	4.071123396486504
1987	4.059296492390167
1988	4.175169551342641
1989	4.0120395516011085
1990	3.8841094577670376
1991	4.047720358029813
1992	3.9712948361849394
1993	3.9286612780668557
1994	3.9138711059399283
1995	3.8287423380203776
1996	3.669658077595942
1997	3.598719074795335
1998	3.695160500007606
1999	3.5592957773788596
2000	2.869907602693248
2001	2.791444019940283
2002	2.9105966628198776
2003	2.814612345001654
2004	2.9087044422749755
2005	2.863771278880085
2006	2.893056065846905
2007	2.923871702277348
2008	3.009019659927271
2009	3.0845921203405187
2010	3.2058163735364977
2011	3.2488601874589653
2012	3.5256334012762314
2013	3.6152257332333955
2014	3.7510969399006213
2015	3.862737122142699
2016	3.996901998718362
2017	4.188489934855361