| Date | Acquired | Amount |
|---|---|---|
| Mar 30, 2016 |
|
$ 138,000,000 |
| Aug 14, 2013 |
|
$ 2,800,000,000 |
| Jun 15, 2012 |
|
Undisclosed amount |
| Oct 15, 1998 |
|
$ 340,000,000 |
| Jun 30, 1997 |
|
$ 188,000,000 |
