Country Date: May 20

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YearsCountry
1983Cameroon
1984Netherlands
1985United States
1986 - 1989Pakistan
1990 - 1991Congo (Democratic Republic)
1992 - 2006United States
2007China
2008 - 2016United States
2017Malawi
2018United States
CountryYears
Cameroon1
China1
Congo (Democratic Republic)2
Malawi1
Netherlands1
Pakistan4
United States26
7 countries