Last week Mamma Mia!, the Abba musical, celebrated its 15th birthday. It made 2 billion dollars in total box-office gross. That's not the only impressive number: Approximately 33,000 rhinestones were hand-sewn on to the Super Trouper costumes. 1,327 performances made Mamma Mia! the longest-running show at London's Prince of Wales theatre. 2420 babies, born in England and Wales, were named Mia. Worldwide 6500 metres of Lycra was used to make the Super Trouper costumes. And the production has been performed more than 13,000 times in 14 languages.