Year	per 1000 people
1960	0.495
1970	0.471
1975	0.476
1980	0.448
1982	0.494
1989	0.358
1992	0.472
1994	0.376
1997	0.476
1998	0.357
1999	0.336
2003	0.465
2008	0.4
2009	0.437
2010	0.426
2015	0.837