To qualify for the Visa Waiver Program, a country must have had a nonimmigrant visa refusal rate of less than 3% for the previous year or an average of no more than 2% over the past two fiscal years with neither year going above 2.5%. In addition, the country must provide visa-free access to United States citizens and has to be either an independent country or a dependency of a VWP country (which has precluded Hong Kong and Macau from participating in the program). (Until April 4, 2016, Argentina charged $160 to U.S. citizens to enter.)