I didn't realize there were so many citizens that weren't actually Americans (we can't hold dual citizenship where I'm from)... I guess the sharp increase since 2008 could also be attributed a moral stand taken due to Bush's election and the wars that have been started since then.
Renouncing US citizenship is both a PITA and difficult so I suspect there's not a whole lot of protest renunciations.
The whole citizenship thing is odd too. You can get dual citizenship by birth easy enough. I could get American citizenship and keep my British no problem but an American wanting to become British would have to renounce their US citizenship. It's just whatever the local laws demand, really.
Just out of interest, what would the place you are do if you were born while your mother was vacationing in the US (automatic US citizenship there)?
Though "Curtain twitcher across the street of the beast" does have a certain ring to it.