| Date | Acquired | Amount |
|---|---|---|
| Feb 29, 2016 |
|
Undisclosed amount |
| Jan 12, 2016 |
|
$ 1,600,000,000 |
| Jan 10, 2016 |
|
$ 1,550,000,000 |
| May 29, 2015 |
|
Undisclosed amount |
| Sep 15, 2014 |
|
Undisclosed amount |
| May 26, 2014 |
|
Undisclosed amount |
| Jul 30, 2012 |
|
Undisclosed amount |
| Jun 04, 2012 |
|
Undisclosed amount |
| Nov 19, 2011 |
|
Undisclosed amount |
