I took Billboard's Year-End Top Pop artists since 2004: Usher, 50 Cent, Chris Brown and Akon.
Google Insights for Search showed that the artists that "won" earlier also scored higher overall. It bore witness to the staying power of the top stars, I guess. As expected, the year that an artist was declared top artist was usually his top year of Google-popularity. Only Chris Brown peaked much higher later than in his "winning" year.
15 hours ago