| Date | Acquired | Amount |
|---|---|---|
| Aug 17, 2017 |
|
Undisclosed amount |
| May 29, 2017 |
|
$ 32,000,000 |
| Dec 21, 2015 |
|
$ 870,000,000 |
| Oct 27, 2014 |
|
$ 80,000,000 |
| Feb 11, 2013 |
|
Undisclosed amount |
| Nov 14, 2012 |
|
Undisclosed amount |
| Mar 09, 2011 |
|
$ 480,000,000 |
| Jan 12, 2011 |
|
$ 60,000,000 |
| Apr 07, 2010 |
|
Undisclosed amount |
| Jan 03, 2008 |
|
$ 120,000,000 |
| Nov 08, 2006 |
|
$ 160,000,000 |
| Jun 16, 2005 |
|
$ 272,000,000 |
| Apr 07, 2005 |
|
Undisclosed amount |
| Nov 04, 2003 |
|
$ 300,000,000 |
| Sep 05, 2000 |
|
$ 75,000,000 |
