Which profession drinks the most coffee?

Wednesday is National Coffee Day and in honor of the big day, Career Builder and Dunkin' Donuts wanted to know which professions demand the most coffee.

The two teamed up and conducted a study between Aug. 17 and Sept. 2 that included more than 3,600 workers nationwide being asked various questions about coffee consumption.

The study found that nurses drink the most coffee followed closely by physicians.

The list of the 12 heaviest coffee drinking professions is as follows:

• 1) Nurses
• 2) Physicians
• 3) Hotel workers
• 4) Designers/Architects
• 5) Financial/Insurance sales representatives
• 6) Food preparers
• 7) Engineers
• 8) Teachers
• 9) Marketing/Public Relations professionals
• 10) Scientists
• 11) Machine operators
• 12) Government workers

The study found that more than two in five Americans say they are less productive without coffee and 40 percent of workers between ages 18 and 24 admit they can't concentrate without coffee.

The study also found that 37 percent of American workers drink two or more cups of coffee during their workday.

Select coffee shops are offering deals in honor of National Coffee Day .

To read the full results of the survey, click here .

How much coffee do you drink? Let us know in the comments section below.