Year	per 1000 people
1960	0.778
1965	0.938
1970	0.726
1979	1.693
1981	1.714
1983	1.255
1989	1.862
1991	1.326
1993	1.862
1997	2.1
2001	3.424
2006	2.899
2007	2.738
2010	2.671
2011	2.968
2014	2.38