I'd be happy to see the "larger version" of the image. Unfortunately the href of the a tag is missing: <a><img src="internet425.jpg" /></a>
The study was done in 05, so not sure how accurate this would be since:
1. networks are not static, a lot of peering relationships keep changing
2. network topology varies from geographic topology
3. video traffic (youtube, etc) since 2005 could have changed the results from this study