| Date | Acquired | Amount |
|---|---|---|
| Oct 18, 2016 |
|
$ 720,000,000 |
| Apr 23, 2015 |
|
Undisclosed amount |
| Feb 06, 2014 |
|
$ 5,000,000 |
| Nov 19, 2012 |
|
$ 25,000,000 |
