| Date | Acquired | Amount |
|---|---|---|
| Jan 22, 2013 |
|
Undisclosed amount |
| Oct 08, 2012 |
|
Undisclosed amount |
| Jul 17, 2012 |
|
Undisclosed amount |
| Aug 18, 2010 |
|
$ 725,000,000 |
| Apr 29, 2010 |
|
$ 44,000,000 |
| Apr 09, 2010 |
|
Undisclosed amount |
| Nov 10, 2009 |
|
Undisclosed amount |
| Dec 22, 2008 |
|
$ 20,000,000 |
| Jan 10, 2008 |
|
$ 57,000,000 |
| Oct 10, 2005 |
|
Undisclosed amount |
