API call not showing queries with 0 conversions, but web dashboard does, why?

I'm trying to pull down search query information, but my API call doesn't bring down the queries with 0 conversions that i see on the web version.

Here's my AWQL call:

("SELECT Query, Conversions   "
        "FROM SEARCH_QUERY_PERFORMANCE_REPORT "
        "DURING YESTERDAY")

Which results in a list of 90 terms, all with a conversion greater than 0.

When I go on the web dashboard and do the same thing...

I see 16k search terms, and tons of them with no conversions. Why?

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