| Date | Acquired | Amount |
|---|---|---|
| Mar 29, 2011 |
|
$ 225,000,000 |
| Mar 21, 2011 |
|
$ 525,000,000 |
| Feb 23, 2010 |
|
$ 250,000,000 |
| Feb 01, 2010 |
|
$ 615,400,000 |
| May 12, 2005 |
|
$ 160,000,000 |
