| June 21, 1953 |
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| 1967 |
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| 1971 |
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| July 2, 1972 |
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| 1973 |
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| 1977 |
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| 1979 |
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| 1984 |
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| April 1986 |
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| December 1988 |
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| 1990 |
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| 1993 |
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| 1994 |
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| September 1996 |
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| November 1996 |
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| April 1999 |
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| October 1999
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| August 2000 |
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| July 2002 |
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| July 2003 |
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| November 2004
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| February 2005
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| July 27, 2007 |
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| Oct. 6, 2007 |
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| Nov. 13, 2007 |
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| Dec. 1, 2007 |
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| Dec. 8, 2007 |
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| Dec. 25, 2007 |
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| Dec. 27, 2007 |
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| Sources:
NewsHour, Associated Press, BBC, Department of State, CNN |