| Date | Acquired | Amount |
|---|---|---|
| Jul 30, 2015 |
|
Undisclosed amount |
| Aug 18, 2014 |
|
$ 1,000,000,000 |
| Jul 07, 2014 |
|
Undisclosed amount |
| Jun 14, 2007 |
|
Undisclosed amount |
