For those of you who are interested in GVT, all-time historical data going back to 1944 is now available on my Google Docs site.
GVT on Google Docs
It's under the GVT folder. Because Google Docs only supports files up to 1 MB, it's only downloadable for now, not browsable. If anybody has any feedback on a format that would be more user-friendly, I'll all ears.