Here is a statistic that can cause any human resource manager's heart to skip a beat. If your organization has 100 employees, 45 of them may be looking for a new job this year.

Before you spill your coffee, however, keep in mind that the U.S. economy has nowhere near enough vacancies for nearly one-half of the workforce to change jobs. Many employees may think about change, but quickly realize that the grass is greener on their side of the fence. Moreover, most of the highly desirable jobs require advanced levels of technical or managerial expertise.

Which careers are most attractive? Glassdoor, a jobs and recruiting website based in Mill Valley, Calif., recently identified the 25 Best Jobs in America for 2016. Rankings are weighted equally among three criteria:

• Number of job openings on its site at the time of the survey.

• Median annual base salary.

• Career opportunities.

            Each career is rated on scale of 1 (bad) to 5 (best). And before HR professionals get any ideas about looking around for themselves, they may want to consider how good they already have it. Their profession checks in at No. 6, with a job score of 4.6.