Year	per 1000 people
1960	0.391
1965	0.435
1970	0.527
1975	0.536
1980	1.065
1981	1.364
1982	1.365
1986	1.304
1990	0.76
1994	1.84
1996	2.02
1997	1.6
2000	2.118
2003	0.533
2005	2.401
2007	2.604
2009	2.804
2010	2.83
2014	0.814