Tourism is one of the most important economic activities in terms of revenue generation. This sector of the economy has seen a great deal of growth since the transfer of the Panama Canal Zone at the end of the twentieth century. The number of hotel rooms increased by more than ten-fold, from 1,400 in 1997 to more than 15,000 in 2013, while the number of annual visitors increased from 457,000 in 1999 to 1.4 million in 2011. The city's hotel occupancy rate has always been relatively high, reaching the second highest for any city outside the United States in 2008, after Perth, Australia, and followed by Dubai. However, hotel occupancy rates have dropped since 2009, probably due to the opening of many new luxury hotels. Several international hotel chains, such as Le Méridien, Radisson, and RIU, have opened or plan to open new hotels in the city, along with those previously operating under Marriott, Sheraton, InterContinental, and other foreign and local brands. The Trump Organization built the Trump Ocean Club, its first investment in Latin America, in 2006 and it is the tallest building in the city. In 2018 it was renamed The Bahia Grand Panama following falling occupancy rates associated with the declining brand value of the Trump name. Hilton Worldwide opened a Hilton Garden Inn in El Cangrejo, and in 2013, The Panamera, the second Waldorf Astoria Hotel in Latin America.