| Date | Acquired | Amount |
|---|---|---|
| Oct 11, 2016 |
|
Undisclosed amount |
| Jul 14, 2016 |
|
$ 850,000,000 |
| Aug 20, 2014 |
|
$ 3,000,000,000 |
| Apr 28, 2008 |
|
Undisclosed amount |
| Mar 06, 2003 |
|
Undisclosed amount |
| Apr 30, 2001 |
|
Undisclosed amount |
