| Date | Acquired | Amount |
|---|---|---|
| May 05, 2016 |
|
$ 110,000,000 |
| Dec 04, 2014 |
|
$ 475,000,000 |
| May 23, 2013 |
|
$ 220,000,000 |
| Nov 19, 2010 |
|
Undisclosed amount |
| Mar 08, 2005 |
|
Undisclosed amount |
| Jan 01, 1991 |
|
$ 27,000,000 |
