| Date | Acquired | Amount |
|---|---|---|
| May 08, 2017 |
|
$ 3,900,000,000 |
| Apr 21, 2017 |
|
$ 240,000,000 |
| Jan 27, 2016 |
|
$ 350,000,000 |
| Dec 09, 2015 |
|
Undisclosed amount |
| Sep 03, 2014 |
|
Undisclosed amount |
| Nov 22, 2013 |
|
Undisclosed amount |
| Oct 03, 2013 |
|
$ 115,350,000 |
| Jun 18, 2013 |
|
Undisclosed amount |
| Apr 11, 2013 |
|
$ 373,000,000 |
| Jan 03, 2012 |
|
$ 200,000,000 |
| Nov 24, 1999 |
|
Undisclosed amount |
| Mar 19, 1999 |
|
Undisclosed amount |
| Dec 03, 1997 |
|
$ 225,000,000 |
