| Date | Acquired | Amount |
|---|---|---|
| Nov 04, 2011 |
|
$ 5,100,000,000 |
| Oct 05, 2011 |
|
Undisclosed amount |
| Sep 17, 2003 |
|
$ 52,000,000 |
| Nov 13, 2002 |
|
$ 1,300,000,000 |
