Do you know the 10 richest persons of USA??

Do you knwo the "Top 10" of the richest persons of the USA?

1 Top 10: Who is number 10?
2 Top 10: Who is number 9?
3 Top 10: Who is number 8?
4 Top 10: Who is number 7?
5 Top 10: Who is number 6?
6 Top 10: Who is number 5?
7 Top 10: Who is number 4?
8 Top 10: Who is number 3?
9 Top 10: Who is number 2?
10 Top 10: Who is number 1?