| Date | Acquired | Amount |
|---|---|---|
| May 31, 2017 |
|
Undisclosed amount |
| Oct 30, 2015 |
|
$ 4,099,999,998 |
| Sep 12, 2006 |
|
$ 195,000,000 |
| Apr 08, 1997 |
|
Undisclosed amount |
