| Date | Acquired | Amount |
|---|---|---|
| Mar 21, 2017 |
|
Undisclosed amount |
| Dec 05, 2016 |
|
$ 3,000,000,000 |
| Feb 17, 2014 |
|
Undisclosed amount |
| Nov 13, 2013 |
|
Undisclosed amount |
| Apr 23, 2008 |
|
Undisclosed amount |
| May 01, 2007 |
|
Undisclosed amount |
