Year	per 1,000 people
1960	0.184
1965	0.271
1970	0.274
1984	0.47
1988	0.26
1990	0.78
1993	0.25
1995	1.1
1997	0.933
1999	0.869
2009	0.908
2017	0.286
2018	0.363
2020	1.28