| Date | Acquired | Amount |
|---|---|---|
| Nov 02, 2017 |
|
$ 42,000,000 |
| Aug 04, 2017 |
|
Undisclosed amount |
| Aug 10, 2016 |
|
Undisclosed amount |
| Aug 10, 2015 |
|
$ 1,330,000,000 |
| Mar 05, 2015 |
|
$ 2,300,000,000 |
| Apr 07, 2014 |
|
Undisclosed amount |
| Feb 11, 2014 |
|
Undisclosed amount |
| Sep 24, 2012 |
|
$ 100,000,000 |
| Jul 24, 1997 |
|
$ 1,810,000,000 |
