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"DuckDuckGo gets its results from over one hundred sources, including DuckDuckBot (our own crawler), crowd-sourced sites (like Wikipedia, which are stored in our own index), Yahoo! (through BOSS), WolframAlpha, Bing, and Yandex." [1]

[1] http://help.duckduckgo.com/customer/portal/articles/216399-s...

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For some reason they never say what percentage of (unique)queries are answered by which source though...

Because it varies widely :). It is entirely based on your query -- whichever source is detected as best for that type of query (i.e. Yandex is better at handling symbols, Bing's advanced syntax is better [mostly]), and of course it changes over time as rules are tweaked and added.

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