| Date | Acquired | Amount |
|---|---|---|
| Dec 01, 2005 |
|
Undisclosed amount |
| Nov 09, 2004 |
|
£ 762,000,000 |
| Aug 21, 2002 |
|
$ 1,140,000,000 |
| Apr 03, 2000 |
|
Undisclosed amount |
| May 01, 1997 |
|
$ 600,000,000 |
