You can still find belt drive bicycles in Japan. For commuters, they have another advantage of being clean. Tokyo commuters who bicycle to the train station and then to work, don't mess around with changing clothes after the commute. The wear their office clothes from home to work and back.
The belt drive doesn't use oil, thus reducing the risk of having clothing getting soiled from a greasy chain AND clothing does not get ruined in the chain/chainring if a belt drive is used.
Belt drives are used on single, three, five, and seven speed internal hubs.