| Date | Acquired | Amount |
|---|---|---|
| Jan 17, 2017 |
|
Undisclosed amount |
| Sep 08, 2008 |
|
$ 10,400,000,000 |
| Nov 01, 2007 |
|
$ 2,900,000,000 |
| Dec 11, 2000 |
|
Undisclosed amount |
