The office jobs that could see you earning nearly 50% less than some of your co-workers https://t.co/IGRiGUrFKm pic.twitter.com/wppA1lvdKy

— World Economic Forum (@wef) November 23, 2016

Here are the white collar jobs — occupations or occupational groups that involve mostly non-physical office work — with the largest pay gaps between full-time, year-round male and female workers as of 2014.

30. Market research analysts and marketing specialists

Average wages for men: $79,902

Average wages for women: $60,798

Female market research analysts and marketing specialists make 76.1% as much as male market research analysts and marketing specialists.

29. Optometrists

Average wages for men: $79,902

Average wages for women: $60,798

Female optometrists make 75.8% as much as male optometrists.

28. Compensation, benefits, and job analysis specialists

Average wages for men: $62,739

Average wages for women: $47,450

Female compensation, benefits, and job analysis specialists make 75.6% as much as male compensation, benefits, and job analysis specialists.

27. Tax examiners and collectors, and revenue agents

Average wages for men:$63,606

Average wages for women: $47,747

Female tax examiners and collectors, and revenue agents 75.1% as much as male tax examiners and collectors, and revenue agents.

26. Opticians

Average wages for men: $45,916

Average wages for women: $34,290

Female opticians make 74.7% as much as male opticians.