Reports have surfaced that U.S. Citizenship and Immigration Services (USCIS) has undercounted H-1B usage by almost 15 percent over the past five years. USCIS must approve 65,000 H-1B visas per year but the data show that the agency has approved approximately 45,000 too few overall between fiscal years 2008 and 2012. Sources attribute the discrepancy to inaccurate estimates of denial rates.