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Simple answer: no.
There's no way to approach even a poor level of reliability in acquiring this data. You could get reasonably reliable data for particularly sets of keywords and regions. But everything worldwide? You're out of luck, I'm afraid ;)
billion dollar info
You could try Adwords broad match on every word in the dictionary, but then it may well cost you a billion to get the data in the first place ;)
Note to self: don't try this
The one exception is ISP-based statistics (like Hitwise), but even then you're only taking a sample. Not a bad one though, although not at all cheap either.
:) I can bet google wont sell it. Then Giant companies will simply monopoly with those keywords.
Yeah, ISP based data might a very negligible solution to look at this problem. Well, it is interesting to know under which ISP providers of world Google makes highest percentage of their sales. lol.