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1975 Greater New York 19.8 Tokyo-Yokohama 17.7
Mexico city 11.9
Shanghai 11.6
Los Angeles-Long Beach 10.8
Sao Paulo 10.7
London 10.4
Buenos Aires 9.3
Rhein-Ruhr 9.3
Paris 9.2
Rio de Janeiro 8.9
Peking 8.7
1990
Tokyo-Yokohama 23.4
Mexico City 22.9
Greater New York 21.8
Sao Paulo 19.9
Shanghai 17.7
Peking 15.3
Rio de Janeiro 14.7
Los Angeles-Long Beach 13.3
Bombay 12.0
Calcutta 11.9
Seoul 11.8
Buenos Aires 11.4
2000
Mexico City 31.0
Sao paulo 25.8
Tokyo-Yokohama 24.2
Grater New York 22.8
Shanghai 22.7
Peking 19.9
Rio de Janeiro 19.0
Bombay 17.1
Calcutta 16.7
Djakarta 16.6
Seoul 14.2
Los Angeles-Long Beach 14.2
