| Date | Acquired | Amount |
|---|---|---|
| Apr 10, 2017 |
|
Undisclosed amount |
| Jun 29, 2016 |
|
Undisclosed amount |
| Feb 29, 2012 |
|
$ 334,000,000 |
| Jul 24, 2006 |
|
$ 5,400,000,000 |
| Feb 06, 2002 |
|
Undisclosed amount |
