| Date | Acquired | Amount |
|---|---|---|
| May 10, 2017 |
|
Undisclosed amount |
| Jun 30, 2015 |
|
Undisclosed amount |
| Sep 22, 2014 |
|
$ 17,000,000,000 |
| Dec 05, 2013 |
|
$ 2,600,000,000 |
| Sep 21, 2005 |
|
Undisclosed amount |
