| Date | Acquired | Amount |
|---|---|---|
| Apr 25, 2016 |
|
$ 820,000,000 |
| Jun 15, 2015 |
|
Undisclosed amount |
| May 26, 2015 |
|
Undisclosed amount |
| Sep 03, 2014 |
|
$ 310,000,000 |
| Nov 26, 2010 |
|
$ 525,000,000 |
| Dec 12, 2004 |
|
$ 850,000,000 |
| Jul 30, 2004 |
|
Undisclosed amount |
