The 1950s saw the commencement of Hong Kong's 40-year rise to global prominence, during which time the Hong Kong Police tackled many issues that have challenged Hong Kong's stability. Between 1949 and 1989, Hong Kong experienced several huge waves of immigration from mainland China, most notably 1958–62. In the 1970s and 1980s, large numbers of Vietnamese boat people arrived in Hong Kong, posing challenges first for marine police, secondly for officers who manned the dozens of camps in the territory and lastly for those who had to repatriate them. The force was granted the use of the title ‘royal’ in 1969 for its handling of the Hong Kong 1967 riots — renaming it the Royal Hong Kong Police Force (Traditional Chinese: ).