| Date | Acquired | Amount |
|---|---|---|
| May 28, 2015 |
|
$ 50,000,000 |
| Feb 25, 2015 |
|
$ 606,000,000 |
| Jun 23, 2014 |
|
$ 309,000,000 |
| Dec 16, 2013 |
|
$ 6,600,000,000 |
| Apr 19, 2013 |
|
Undisclosed amount |
| Apr 11, 2013 |
|
Undisclosed amount |
