With the Nanhui District merger in May 2009, the size of Pudong's economy grew. The district's 2015 gross domestic product amounts to an estimated 789.8 billion RMB (~US$113.5 billion), with services comprising 70% of economic output. Its GDP per capita in terms of purchasing power parity is approximately $50,783. The area is divided into four distinct economic districts. Apart from Lujiazui Trade and Finance Zone, there is Waigaoqiao Free Trade Zone, the largest free trade zone in mainland China covering approximately in north-east Pudong. The Jinqiao Export Processing Zone is another major industrial area in Pudong covering Zhangjiang Hi-Tech Park is a special area for technology-oriented businesses.