What website is best for finding out how much money wiz khalifa makes?

Forbes just released their annual Hip-Hop Cash Kings list for the highest earning rappers from 2011. Wiz Khalifa comes in at #11 earning just over $11,000,000 last year after his career skyrocketed with the release of his “Kush & Orange Juice” mixtape, signing with Atlantic Records, and touring across the world (literally) non stop.