Hi Peace, a couple of useful sites, thanks.

From that last one since 1945 the US has built 70,000 nuclear weapons covering a range of 65 types. As of 2002 US had stockpiled 10,600 nuclear weapons of various types of which 2,700 were not deployed. The US wishes ultimately to maintain 4,900 weapons for contingency purposes. Seems as though there is evidence of a bit of a trend there.

Oddly enough, the one fact that I though would have appeared was number used outside of tests - Since 1945 - None.

If the US engaging in a nuclear pre-emptive strike is all you have to worry about, then your world must be in pretty good shape.