According to data collected by the U.S. Bureau of Labour Statistics (BLS), the average national median salary was $29,890 ($14.37 was the hourly median) while it ranged from below $19,650 to above $44,390. Salaries are varied in different states and provinces, and also depend on the amount of experience as well as the qualifications that have been obtained. The salaries for supervisors are more than those of workers or technicians.