Neither thread is conclusive, but both have useful leads. Good luck. (Please note the search box - in the top left of every page.)
Here's the GoKunming write-up of the Yunnan census figures: www.gokunming.com/[...]
(I'm not awake enough to run the figures right now, but I seem to remember that the percentage of the foreigners in China that are based in Yunnan is significantly higher than the percentage of Chinese nationals based in Yunnan.)
I've not seen any figures published regarding the expat population of Kunming. Yuanyangren's estimation method seems like a sensible approach.
Qianwang Jie is a little alley behind the Zhengyi Fang mall - get to the mall and you'll be able to track down the café
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