Year	per 1,000 people
1960	0.746548891067505
1970	1.0809999704361
1988	2.09870004653931
1990	2.0720999241
2001	0.6
2004	0.1
2010	0.84
2011	0.7
2013	0.7
2015	0.8
2016	0.9