| Date | Acquired | Amount |
|---|---|---|
| Apr 30, 2009 |
|
Undisclosed amount |
| Oct 03, 2006 |
|
$ 60,000,000 |
| Feb 15, 2006 |
|
$ 109,000,000 |
| Oct 19, 2005 |
|
$ 36,500,000 |
| Jan 31, 2001 |
|
Undisclosed amount |
| May 08, 2000 |
|
$ 1,700,000,000 |
