Year	per 1000 people
1980	2.06
1981	2.218
1982	2.181
1983	2.247
1984	2.166
1985	2.287
1986	2.399
1987	2.519
1988	2.538
1989	2.423
2011	5.01
2012	5.261
2013	5.225
2014	6.363