| Date | Acquired | Amount |
|---|---|---|
| Oct 18, 2017 |
|
$ 60,000,000 |
| Apr 27, 2016 |
|
$ 800,000,000 |
| Apr 07, 2016 |
|
Undisclosed amount |
| Feb 24, 2015 |
|
Undisclosed amount |
| Jun 25, 2014 |
|
$ 528,000,000 |
| Jul 24, 2013 |
|
Undisclosed amount |
| Mar 06, 2011 |
|
Undisclosed amount |
| Nov 01, 2010 |
|
Undisclosed amount |
