An early one opened in Bangkok in 1956. They spread worldwide, driven by the overseas expansion of Japanese companies during the country's rapid economic growth. Total enrollment in these schools hovered in the 2,000s during the 1970s before increasing to around 21,000 by 2014, education ministry data shows. But the number began dropping in 2015, falling roughly 20% over 10 years to around 16,000 in 2024. The decline results both from Japan's tumbling birth rate and a growing trend of families choosing other schools. Lifestyle changes leading to more Japanese employees being posted overseas without families and fewer people leaving Japan due to the coronavirus pandemic also are seen as factors.