Year	per 1000 people
1970	0.033
1981	0.049
1982	0.065
1989	0.072
1990	0.07
1991	0.192
1993	0.285
1995	0.4
1996	0.666
2000	0.777
2004	1.007
2007	1.749
2009	1.61
2010	1.579
2014	2.154
2015	3.611