Year	per 1,000 people
1970	2.5504340996636667
1975	1.9157766403877576
1976	2.127802084969888
1980	3.3261601479411644
1981	2.438242477437647
1982	2.3824810928945133
1983	2.4114674436734274
1984	2.4546544286881433
1985	3.2848934706693633
1986	2.3966326593463183
1989	2.4857748553602543
1990	2.3408509869244885
1991	2.4209031049060967
1992	2.428704604580361
1993	3.436779729918162
1994	3.5270344527210784
1995	3.8017554555607678
1996	3.80371543489792
1997	3.7082878158063823
1998	3.3892572721742162
1999	3.700201656092485
2000	2.821127817496054
2001	2.753665299537535
2002	2.5649889208598737
2003	2.946150374216615
2004	2.969357234880202
2005	2.9433543998447655
2006	2.9023864195509144
2007	3.0415547411981754
2008	3.1642920313634697
2009	2.9538257542925064
2010	3.142580371641001
2011	3.2136058875075717
2012	3.498160977502166
2013	3.683731862936939
2014	3.852705176573311
2015	4.1856960683237
2016	4.2629899041108175
2017	4.515422238257597