Country Date: April 4

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YearsCountry
1983 - 1984Cameroon
1985United States
1986 - 1989Pakistan
1990Congo (Democratic Republic)
1991South Africa
1992 - 2006United States
2007China
2008 - 2012United States
2013Liberia
2014 - 2020United States
CountryYears
Cameroon2
China1
Congo (Democratic Republic)1
Liberia1
Pakistan4
South Africa1
United States28
7 countries