| Date | Acquired | Amount |
|---|---|---|
| Aug 05, 2015 |
|
$ 240,000,000 |
| Jun 01, 2012 |
|
Undisclosed amount |
| Nov 04, 2011 |
|
Undisclosed amount |
| Dec 08, 2008 |
|
Undisclosed amount |
| Nov 12, 2007 |
|
Undisclosed amount |
| Aug 03, 2005 |
|
$ 3,800,000,000 |
| Sep 17, 1997 |
|
$ 1,400,000,000 |
