Although 2013 is coming to an end, 75 percent of workers have not used all of their vacation time as of the end of November, according to a new survey by Adecco Staffing US.

The survey also finds that 36 percent of respondents receive at least three weeks of vacation time a year, and 44 percent of respondents would gladly take another week or two of vacation time. Twenty-two percent of respondents report that they would like at least three more weeks of vacation time.

"It's interesting that many workers are not taking advantage of their available vacation days for the year yet are hungry for more time off," says Joyce Russell of Adecco Staffing. "Managers should encourage an environment that supports a work-life balance through time outside the office. By developing a plan to ensure that all business needs are being met in the workplace while co-workers are out, there's no reason that staff shouldn't be taking their days."