Year	per 1,000 people
1960	0.027
1965	0.021
1970	0.013
1981	0.019
1984	0.087
1989	0.023
1990	0.022
1993	0.028
2003	0.011
2004	0.021
2008	0.019
2009	0.019
2013	0.013
2016	0.031
2018	0.15
2020	0.049