| Date | Acquired | Amount |
|---|---|---|
| Oct 20, 2015 |
|
Undisclosed amount |
| Aug 18, 2015 |
|
$ 694,000,000 |
| Jul 16, 2014 |
|
$ 185,000,000 |
| May 29, 2014 |
|
$ 450,000,000 |
| Dec 23, 2013 |
|
Undisclosed amount |
| May 23, 2012 |
|
Undisclosed amount |
| Dec 19, 2011 |
|
$ 1,375,000,000 |
| Dec 06, 2007 |
|
Undisclosed amount |
| May 24, 2006 |
|
Undisclosed amount |
| Nov 01, 2005 |
|
Undisclosed amount |
| Sep 14, 2005 |
|
Undisclosed amount |
| Dec 07, 1999 |
|
Undisclosed amount |
| Jul 03, 1997 |
|
$ 325,000,000 |
| Jan 01, 1996 |
|
Undisclosed amount |
| Sep 21, 1995 |
|
Undisclosed amount |
