| Date | Acquired | Amount |
|---|---|---|
| Mar 10, 2015 |
|
Undisclosed amount |
| Mar 02, 2015 |
|
$ 12,000,000,000 |
| Jul 26, 2010 |
|
Undisclosed amount |
| Aug 11, 2008 |
|
$ 110,000,000 |
| Dec 21, 2007 |
|
Undisclosed amount |
| May 04, 1999 |
|
$ 1,000,000,000 |
