| Date | Acquired | Amount |
|---|---|---|
| Jul 06, 2017 |
|
$ 700,000,000 |
| Jun 09, 2015 |
|
$ 231,000,000 |
| Aug 08, 2013 |
|
Undisclosed amount |
| May 23, 2013 |
|
Undisclosed amount |
| Aug 06, 2012 |
|
$ 1,550,000,000 |
| Nov 29, 1994 |
|
$ 1,100,000,000 |
