On September 27 Dunkin' Donuts and the job search engine Careerbuilder.com announced the findings of their first joint survey to understand coffee's role in the "daily grind."

The market research company NPD Group's Consumer Reports on Eating Share Trends (CREST) found Dunkin' Donuts is "the number one retailer in the hot regular/decaf plus flavored coffee and iced coffee categories."

The Dunkin' Donuts/Careerbuilder survey took place August 17 through September 2 and polled 3,600 workers across the US to determine what professions need their caffeine fix the most. Here are the top five jobs: nurses, physicians, hotel workers, designers/architects and financial/insurance sales representatives.