10 Year look at Album Sales year 2000 and 2010.. Difference?

Year 2000

1. No Strings Attached / 'N Sync ~ 9,936,104

2. The Marshall Mathers LP / Eminem ~ 7,921,107

3. Oops!... I Did It Again / Britney Spears ~ 7,893,544

4. Human Clay / Creed ~ 6,587,834

5. Supernatural / Santana ~ 5,857,824

6. 1 / The Beatles ~ 5,068,300

7. Country Grammar / Nelly ~ 5,067,529

8. Black & Blue / Backstreet Boys ~ 4,289,865

9. 2001 / Dr. Dre ~ 3,992,311

10. The Writing's on the Wall / Destiny's Child ~ 3,802,165

Year 2010

1.Recovery / Eminem ~ 3,415,000

2. Need You Now / Lady Antebellum ~ 3,089,000

3. Speak Now / Taylor Swift ~ 2,960,000

4. My World 2.0 / Justin Bieber ~ 2,319,000

5. The Gift / Susan Boyle ~ 1,852,000

6. The Fame / Lady Gaga ~ 1,591,000

7. Soldier of Love / Sade ~ 1,300,000

8. Thank Me Later / Drake ~ 1,269,000

9. Raymond v. Raymond / Usher ~ 1,183,000

10.Animal / Ke$ha ~ 1,143,000

Source: Neil Scan: Nielsen provides charts and insights for both music broadcast and sales. We capture in excess of 100 million song performances on more than 2,000 radio, satellite radio, network radio, and music video channels across Canada, Mexico, Puerto Rico and the United States. Nielsen’s tracking of music sales data is used by all major and most independent record companies as well as distribution companies, artist managers, booking agents, concert promoters, performing rights organizations, government agencies, venue owners, traditional retailers, online retailers, and digital delivery companies. Nielsen’s data on airplay and sales is featured weekly in Billboard magazine and is widely cited by numerous publications and broadcasters as the standard for music industry measurement.

http://nielsen.com/us/en/industries/media-entertainment/music.html