Since the summer of 2000, Copenhagen and the Swedish city of Malmö have been connected by the Øresund Bridge, which carries rail and road traffic. As a result, Copenhagen has become the centre of a larger metropolitan area spanning both nations. The bridge has brought about considerable changes in the public transport system and has led to the extensive redevelopment of Amager. The city's service and trade sectors have developed while a number of banking and financial institutions have been established. Educational institutions have also gained importance, especially the University of Copenhagen with its 35,000 students. Another important development for the city has been the Copenhagen Metro, the railway system which opened in 2002 with additions until 2007, transporting some 54 million passengers by 2011.