Country Date: May 21
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| Years | Country |
|---|---|
| 1983 | Cameroon |
| 1984 | Netherlands |
| 1985 | United States |
| 1986 - 1989 | Pakistan |
| 1990 - 1991 | Congo (Democratic Republic) |
| 1992 - 2006 | United States |
| 2007 | China |
| 2008 - 2014 | United States |
| 2015 | Germany |
| 2016 | United States |
| 2017 | Malawi |
| 2018 - 2023 | United States |
| Country | Years |
|---|---|
| Cameroon | 1 |
| China | 1 |
| Congo (Democratic Republic) | 2 |
| Germany | 1 |
| Malawi | 1 |
| Netherlands | 1 |
| Pakistan | 4 |
| United States | 30 |
| 8 countries | |