Year	per 1,000 people
1960	2.38925075531006
1970	1.62940001487732
1975	1.68299996852875
1989	1.32009994983673
1990	0.9322000146
1993	1.2999999523
1994	0.6008999944
1996	1.3400000334
2002	1.2000000477
2005	1.2
2006	1.3
2007	1.3
2008	1.3
2009	1.3
2010	1.3
2011	1.36
2014	0.83
2015	0.78
2016	0.83