| Date | Acquired | Amount |
|---|---|---|
| Jul 06, 2017 |
|
$ 2,100,000,000 |
| Aug 17, 2015 |
|
$ 2,400,000,000 |
| Dec 05, 2012 |
|
Undisclosed amount |
| Feb 25, 2012 |
|
Undisclosed amount |
