OIDIA outsold BOMT in Germany, Italy, Sweden, Switzerland, Finland, South Korea, Austria, and most of Asia.
Britney outsold OIDIA in South Korea and most Asian countries with the exception of Japan. The era also did way better than OIDIA in France.
ITZ outsold Britney in the UK, Japan, Italy, and Norway.
Blackout outsold ITZ in Russia.
Circus outsold Blackout everywhere.
FF outsold Circus in Brazil and Sweden.
Britney Jean outsold FF in China.
Declines with every album they said!