Search Impression Share available on Geographic View but not available on GEO_PERFORMANCE_REPORT on API

Hey all,

I am trying to get Search Impression Share with location level detail at the Campaign Level.  When I work with the online Adwords portal under Dimensions Tab > View: Geographic, I am able to add Serach Impr. Share to the report, then download manually.  How would I go about achieving the same thing, but with the v201605 Adwords API?  Search Impr. Share is not available on the GEO_PERFORMANCE_REPORT.

Example:

Many thanks,

John H.

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