| Date | Acquired | Amount |
|---|---|---|
| Oct 07, 2015 |
|
Undisclosed amount |
| Jul 07, 2015 |
|
Undisclosed amount |
| May 18, 2010 |
|
Undisclosed amount |
| Apr 10, 2008 |
|
Undisclosed amount |
| Dec 07, 2006 |
|
$ 1,400,000,000 |
