| Date | Acquired | Amount |
|---|---|---|
| May 31, 2016 |
|
$ 1,500,000,000 |
| May 11, 2016 |
|
$ 20,500,000 |
| Dec 19, 2013 |
|
Undisclosed amount |
| Apr 26, 2012 |
|
$ 650,000,000 |
| Apr 19, 2005 |
|
$ 122,600,000 |
