| Date | Acquired | Amount |
|---|---|---|
| Nov 24, 2015 |
|
$ 154,000,000 |
| May 14, 2015 |
|
$ 411,000,000 |
| Jun 29, 2011 |
|
Undisclosed amount |
| Dec 19, 2008 |
|
Undisclosed amount |
| Jul 01, 2005 |
|
$ 1,008,000,000 |
| Dec 10, 2004 |
|
Undisclosed amount |
