Country Date: May 19
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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 - 2012 | United States |
| Country | Years |
|---|---|
| Cameroon | 1 |
| China | 1 |
| Congo (Democratic Republic) | 2 |
| Netherlands | 1 |
| Pakistan | 4 |
| United States | 21 |
| 6 countries | |