Dubai Duty Free (DDF) is the company responsible for the duty-free operations at Dubai International Airport. DDF became the largest airport retailer in the world in terms of sales in 2012. DDF represents over 5% of global duty-free sales, generating 2014 revenues of $1.91 billion. Sheikh Ahmed bin Saeed Al Maktoum, the uncle of the ruler of Dubai, is the company's chairman and Colm McLoughlin is the Executive Vice Chairman. DDF is a subsidiary of the government-owned Investment Corporation of Dubai. The company began operations at Dubai International Airport in December 1983.