| Date | Acquired | Amount |
|---|---|---|
| May 29, 2013 |
|
$ 325,000,000 |
| Aug 03, 2012 |
|
$ 3,000,000,000 |
| May 15, 2012 |
|
£ 61,000,000 |
| Jun 09, 2010 |
|
$ 253,000,000 |
| May 24, 2010 |
|
$ 135,000,000 |
| Apr 20, 2009 |
|
Undisclosed amount |
| Oct 29, 2008 |
|
$ 57,000,000 |
| Apr 22, 2008 |
|
$ 720,000,000 |
| Nov 21, 2007 |
|
$ 1,650,000,000 |
| Oct 09, 2006 |
|
$ 507,000,000 |
| Sep 07, 2005 |
|
$ 1,400,000,000 |
| May 02, 2005 |
|
$ 233,000,000 |
