How big is the self-defense market in the U.S.?

I'm looking for a breakdown according to the amount of money spent on tazers,
mace, guns, self-defense classes, and any other products that might
fit into the category of self-defense.

Have these numbers increased over the past few years?  Which cities
have spent the most on self-defense products?

Thank you!

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Clarification of Question by maironic-ga on 30 Mar 2004 14:47 PST

I am particularly interested in the total amounts spent by women, but
I would settle for both men and women if the information is limited.