Lady Gaga among which sold more singles in 2011

Gaga is at #6. See the "Top 10":

01. Rihanna: 23.352.000
02. Pitbull: 20.542.000
03. Bruno Mars: 20.199.000
04. Adele: 19.625.000
05. Katy Perry: 17.108.000
06. Lady Gaga: 15.533.000
07. David Guetta: 12.893.000
08. LMFAO: 12.490.000
09. Britney Spears: 10.095.000.
10. Black Eyed Peas: 8.896.000