Another huge factor in Singapore and UAE is the language and culture overlap with places with millionaire outflows. There are many other places in the world that are unlikely to threaten your private property or demand absolute loyalty to government connected families, but you won't get by speaking Mandarin or Arabic in most of them.
More surprising to see Greece on the list, which doesn't do particularly well in either it's reputation for good governance or there being many Greek speakers stuck in much more corrupt or dangerous places.
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Another huge factor in Singapore and UAE is the language and culture overlap with places with millionaire outflows. There are many other places in the world that are unlikely to threaten your private property or demand absolute loyalty to government connected families, but you won't get by speaking Mandarin or Arabic in most of them.
More surprising to see Greece on the list, which doesn't do particularly well in either it's reputation for good governance or there being many Greek speakers stuck in much more corrupt or dangerous places.
Greece and Portugal offer access to the EU. If they were not part of the EU, the flow would probably be negative.