Year	per 1000 people
1960	0.152
1965	0.259
1970	0.368
1980	1.333
1981	1.633
1982	1.562
1983	1.44
1990	1.071
1993	1.441
1997	1.259
2004	1.24
2008	1.823
2009	1.934
2010	1.9
2014	2.092