var report = AdWordsApp.report(
"select CampaignName, AdGroupName, CountryCriteriaId, RegionCriteriaId, Year, Month, Clicks, Impressions, Cost, AverageCpc, AveragePosition " +
"from GEO_PERFORMANCE_REPORT " +
"during LAST_MONTH");
However, the numbers for Cost and Impressions don't match ( they're lower on the AWQL generated report ). Only the number of clicks match.