| Date | Acquired | Amount |
|---|---|---|
| Oct 26, 2011 |
|
$ 322,000,000 |
| Jul 22, 2009 |
|
$ 25,000,000 |
| Sep 05, 2007 |
|
$ 85,000,000 |
| Feb 16, 2007 |
|
Undisclosed amount |
| Oct 26, 2006 |
|
$ 50,000,000 |
| Oct 25, 2006 |
|
$ 50,000,000 |
| Mar 24, 2004 |
|
$ 20,000,000 |
| May 17, 2000 |
|
$ 70,000,000 |
| Jul 01, 1998 |
|
$ 760,000,000 |
