28/7=4m per year for gaga
39/9=4.15 per year for Taylor
19/4=4.75 per year for 1D
17/5=3.4m per year for Justin
30/10=3m per year for rih
32/12=2.7m per year for bey
82m/15=5.5m per year for Britney
14.6/7=2.1 per year for katy
28/7=4m per year for gaga
39/9=4.15 per year for Taylor
30/10=3m per year for rih
32/12=2.7m per year for bey
82m/15=5.5m per year for Britney
14.6/7=2.1 per year for katy