The happiest city in the world

Rio de Janeiro
Do you know which is the happiest city in the world? According to the company GfK Custom Research that privilege belongs to Rio de Janeiro , where the best carnival of all is celebrated. After a survey of 10,000 people from 29 countries, the results were as follows:

1- Rio de Janeiro
2- Sydney
3- Barcelona
4- Amsterdam
5- Melbourne
6- Madrid
7- San Francisco
8- Rome
9- Paris
10- Buenos Aires

Do you agree with this curious classification?