| Date | Acquired | Amount |
|---|---|---|
| May 20, 2013 |
|
Undisclosed amount |
| May 20, 2013 |
|
Undisclosed amount |
| Dec 17, 2012 |
|
$ 2,200,000,000 |
| Oct 19, 2009 |
|
Undisclosed amount |
| Jul 28, 2009 |
|
Undisclosed amount |
| Aug 15, 2005 |
|
$ 35,000,000,000 |
