| Date | Acquired | Amount |
|---|---|---|
| Oct 26, 2015 |
|
Undisclosed amount |
| May 26, 2006 |
|
$ 9,800,000,000 |
| Jan 23, 2004 |
|
$ 6,000,000,000 |
| May 17, 2002 |
|
Undisclosed amount |
| Feb 07, 2001 |
|
Undisclosed amount |
