| Date | Acquired | Amount |
|---|---|---|
| Oct 06, 2017 |
|
$ 600,000,000 |
| Oct 13, 2016 |
|
$ 430,000,000 |
| Oct 13, 2016 |
|
Undisclosed amount |
| Sep 28, 2015 |
|
$ 46,000,000 |
| Jan 15, 2015 |
|
$ 125,000,000 |
| May 31, 2012 |
|
Undisclosed amount |
| Sep 18, 2008 |
|
Undisclosed amount |
| Oct 27, 2000 |
|
Undisclosed amount |
| Jun 30, 2000 |
|
Undisclosed amount |
| Oct 04, 1999 |
|
Undisclosed amount |
