| Date | Acquired | Amount |
|---|---|---|
| Jun 18, 2008 |
|
Undisclosed amount |
| Nov 07, 2007 |
|
$ 20,000,000 |
| Aug 08, 2005 |
|
Undisclosed amount |
| Oct 14, 2004 |
|
Undisclosed amount |
| Oct 14, 2004 |
|
Undisclosed amount |
| Jul 14, 2004 |
|
$ 70,000,000 |
| Mar 03, 2004 |
|
Undisclosed amount |
| Nov 14, 2003 |
|
Undisclosed amount |
| Aug 02, 2002 |
|
Undisclosed amount |
| Apr 09, 2001 |
|
$ 23,000,000 |
| Jul 19, 2000 |
|
$ 1,600,000,000 |
| Jan 20, 2000 |
|
$ 700,000,000 |
