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In page Waves of mass migrations from Hong Kong:

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The Tiananmen Square massacre of 1989 in Beijing triggered mass migration in the 1990s. Canada, Australia, and other Commonwealth realms were the primary destinations for migrants at the time. In particular, popular cities for migrants included Metro Vancouver and the Greater Toronto Area in Canada, Sydney and Melbourne in Australia, and London in the UK. To a lesser extent, other immigrant destinations included San Francisco and New York in the US, as well as several Asian cities including Singapore, which was formerly a British colony.[1] At the height of the mass migration wave, some small states like Cape Verde advertised their passport in magazines. Some foreign embassies took bribes for giving out passports, amounting to outright political corruption.