Chinese shoppers. Properly, more than all other nationalities combined. Their buying power is unimaginable. Just wondering that recent stocks drop in their markets properly has been overflown. The effect was seldom felt at least here.
A lot of stores even advertise that they have Chinese speaking clerks ready to help. There are not a whole lot of advertisement of foreign language here. But, Chinese is probably an exception.
After they reformed their written language, not using Chinese characters, they pick it up at their schools. I guess $$$ talks more effectively than anything else.