Robert H Burns took over as chairman of the WTTC in 1993, at which time there were 68 members. It began releasing tourism impact information around the same time, working with Wharton Econometric Forecasting Associates to develop the data. The WTTC formed a group known as the Tourism Satellite Account (TSA) to compile and release the data. The TSA was recognized by the United Nations Statistical Commission in 1999. During the 1990s, the WTTC expanded the activities of the council to include education and training, air transport liberalisation, taxation, and sustainable development. The new activities led to the creation of the World Travel & Tourism Human Resources Centre in Vancouver and the World Travel & Tourism Taxation Policy Centre in the United States.