| Date | Acquired | Amount |
|---|---|---|
| Oct 23, 2017 |
|
Undisclosed amount |
| Oct 10, 2017 |
|
Undisclosed amount |
| May 24, 2017 |
|
Undisclosed amount |
| Apr 20, 2017 |
|
Undisclosed amount |
| Apr 12, 2017 |
|
$ 100,000,000 |
| Feb 16, 2016 |
|
$ 624,000,000 |
| Jun 24, 2015 |
|
Undisclosed amount |
| Jun 15, 2015 |
|
$ 84,000,000 |
| Feb 05, 2015 |
|
$ 273,000,000 |
| Jun 02, 2014 |
|
$ 752,000,000 |
| Oct 31, 2013 |
|
Undisclosed amount |
| Mar 31, 2006 |
|
Undisclosed amount |
