Estimated Number of World Nuclear Explosions

Explosion

United States

USSR/ Russia

United Kingdom

France

China

India

Pakistan

North Korea

Total

Year of first explosion	1945	1949	1952	1960	1964	1974	1998	2006
Atmospheric explosions	217¹	219²	21³	50	23	0	0	0	530
Underground explosions	815	496	24³	160	22	3	2	1	1,523
Total	1,032	715	45	210	45	3	2	1	2,053
Data as of July, 2000. 1) Four were underwater explosions. 2) Three were underwater explosions. 3) All British tests since 1962 have been conducted jointly with the United States. Thus, the U.S. tests are higher than the U.S. figures given above.

Source: Stockholm International Peace Research Institute (SIPRI). North Korea test verified by U.S. national intelligence director.

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