| Date | Acquired | Amount |
|---|---|---|
| Aug 09, 2016 |
|
Undisclosed amount |
| Apr 13, 2016 |
|
Undisclosed amount |
| Jun 15, 2015 |
|
$ 4,000,000,000 |
| Nov 13, 2014 |
|
$ 325,000,000 |
