| Date | Acquired | Amount |
|---|---|---|
| Feb 21, 2017 |
|
$ 385,000,000 |
| Apr 11, 2016 |
|
$ 1,500,000,000 |
| Feb 18, 2016 |
|
$ 6,000,000,000 |
| Jul 30, 2015 |
|
$ 2,800,000 |
