Since 1975, many "dai pai dong" have been moved into temporary markets, like the ones on Haiphong Road, Tsim Sha Tsui, or into cooked food centres, usually located in municipal services complexes managed by the Urban Council, for easier control. To improve worsening public hygiene, the government began to buy back "big licenses" from the license-holders in 1983. Since most of the licensees were aged, and the licenses are only legally transferable to their spouses, many of the licensees were willing to return their licenses for compensation. Since then, the number of traditional "dai pai dong" has declined rapidly.