| Date | Acquired | Amount |
|---|---|---|
| Jan 26, 2016 |
|
$ 2,350,000,000 |
| Feb 19, 2013 |
|
$ 1,410,000,000 |
| Nov 15, 2012 |
|
Undisclosed amount |
| May 02, 2011 |
|
Undisclosed amount |
| Jan 04, 2011 |
|
$ 169,600,000 |
| Nov 04, 2008 |
|
Undisclosed amount |
| Aug 03, 2004 |
|
$ 53,000,000 |
