Year	per 1,000 people
1960	0.312
1970	0.224
1975	0.218
1983	0.407
1985	0.445
1993	1.027
1996	1.324
2004	1.429
2005	1.211
2006	0.861
2007	1.031
2008	0.781
2009	1.132
2010	1.082
2011	1.141
2012	0.976
2016	2.02
2018	2.328
2019	2.107