Nuclear Tests Statistics for the Period of 1945 - 1996:
United States: 215 atmospheric tests + 815 underground tests =
1,030
USSR: 219 atmospheric tests + 496 underground tests = 715
UK: 21 atmospheric tests + 24 underground tests = 45
France: 50 atmospheric tests + 160 underground tests = 210
China: 23 atmospheric tests + 22 underground tests = 45
The grand total of global atmospheric tests = 528
Source: Page 52, "Atomic Audit, the Costs and Consequences of U.S. Nuclear Weapons Since 1940," Stephen Schwartz, Editor, Brookings Institution Press, Washington D.C., 1998.