"The Intelligence Authorization Act (IAA) for Fiscal Year (FY) 20101 requires the President to submit an annual 'Report on Security Clearance Determinations to Congress'. The IAA directs this report to include the number of United States Government (USG) employees who held a security clearance at each level as of October 1 of the preceding year and the number of USG employees who were approved for a security clearance at each level during the preceding fiscal year. Similar data pertaining to USG contractors is also required. Also, for each element of the Intelligence Community (IC), in-depth security clearance timeliness determination metrics are required."
United States. Office of the Director of National Intelligence: http://www.dni.gov/