Year	per 1000 people
1960	0.061
1965	0.106
1970	0.134
1981	0.55
1986	1.346
1990	1.433
1993	1.335
1997	1.66
2000	0.699
2001	0.657
2004	1.37
2007	1.622
2008	1.997
2009	2.017
2010	2.35
2011	2.416
2012	2.425
2014	2.568