| Date | Acquired | Amount |
|---|---|---|
| Nov 24, 2015 |
|
$ 975,000,000 |
| Nov 14, 2014 |
|
CA$ 175,000,000 |
| Aug 12, 2013 |
|
$ 575,000,000 |
| Nov 26, 2003 |
|
Undisclosed amount |
