Geo distribution of BTC

[btcmind]

Is there rough data where BTCs are distributed? I assume that exchange accounts are mostly correlated with BTC holdings. With Google trends one can see that the scope of Bitcoin has broadened in the last few months, but it's still much more searched in the West.

[btc_lurker]

Here is a rough distribution out of nowhere: 70% US, 15% Russia, 15% rest of the world.