Year	per 1000 people
1960	0.244
1965	0.257
1970	0.306
1981	0.338
1986	0.347
1987	0.376
1988	0.318
1993	0.318
1996	0.85
1998	1.049
2004	0.877
2005	0.882
2010	0.89
2014	1.491