What are the names of the richest men in the world?

What are the names of the richest men in the world?
Top Ten:

1. Carlos Slim Helu- 53.5 billion
2. William Gates III- 53 billion
3. Warren Buffet- 47 billion
4. Mukesh Ambani- 29 billion
5. Lakshmi Mittal- 28.7 billion
6. Lawrence Ellison- 28 billion
7. Bernard Arnault- 27.5 billion
8. Eike Batista- 27 billion
9. Amancio Ortega- 25 billion
10. Karl Albricht- 23.5 billion