For National Science Foundation (NSF) awards during fiscal years 2000 through 2016, budgeted indirect costs varied from 16 to 24 percent of the total annual amounts the agency awarded. The percentage fluctuated during this period, though this percentage generally has increased since reaching a low point in 2010. The variation from year-to-year was based on various factors such as by the types of activities supported by the awards and the types of awardee organizations receiving the awards.