| Date | Acquired | Amount |
|---|---|---|
| Sep 20, 2016 |
|
$ 850,000,000 |
| Aug 27, 2015 |
|
$ 39,000,000 |
| May 05, 2010 |
|
$ 15,000,000 |
| May 07, 2009 |
|
Undisclosed amount |
| Jan 31, 2008 |
|
Undisclosed amount |
| Feb 08, 2007 |
|
Undisclosed amount |
