| Date | Acquired | Amount |
|---|---|---|
| Jan 06, 2016 |
|
Undisclosed amount |
| Sep 29, 2015 |
|
Undisclosed amount |
| Jun 02, 2014 |
|
Undisclosed amount |
| May 03, 2006 |
|
$ 5,500,000,000 |
