| Date | Acquired | Amount |
|---|---|---|
| Feb 04, 2016 |
|
$ 43,000,000,000 |
| Jan 11, 2016 |
|
$ 1,000,000,000 |
| Mar 23, 2015 |
|
Undisclosed amount |
| Jan 01, 2013 |
|
Undisclosed amount |
