OP, I sympathize with your frustration. You tried to avoid giving a specific number - she's the one who insisted on knowing it. It would feel kinda like a setup to me, I think. If somebody made that big a point of getting that information form a spouse it would lead the spouse to believe that having that very specific information was very important.
That's probably the main problem. This happens w/ me and DH a lot.
DH--What do you want for dinner?
Me--Oh I dunno, whatever you want.
DH--Well, what? Pizza, chinese, ...?
Me--I don't really have a strong opinion on it. What do you want?
DH--I asked you first!
[This has, in the past, gone on for quite a while, so now I tend to cut to--]
Me--How about pizza?
DH--I'd rather get chinese.
It's like browbeating me for an opinion is done for the express purpose of finding out what he wants to vote against.
OT, but this whole thread reminds me og a standup comedy routine.