| Date | Acquired | Amount |
|---|---|---|
| Jul 06, 2007 |
|
Undisclosed amount |
| Dec 06, 2006 |
|
Undisclosed amount |
| Jul 20, 2005 |
|
Undisclosed amount |
| Jul 18, 2003 |
|
$ 1,200,000,000 |
| Jul 09, 2002 |
|
$ 65,000,000 |
