| Date | Acquired | Amount |
|---|---|---|
| Dec 16, 2015 |
|
Undisclosed amount |
| Oct 02, 2015 |
|
Undisclosed amount |
| Mar 31, 2015 |
|
Undisclosed amount |
| Nov 17, 2014 |
|
Undisclosed amount |
| Jul 01, 2013 |
|
Undisclosed amount |
| Jul 02, 2012 |
|
$ 2,500,000,000 |
| Jan 20, 2012 |
|
Undisclosed amount |
| Feb 09, 2010 |
|
$ 1,270,000,000 |
| May 20, 2009 |
|
Undisclosed amount |
| Mar 08, 2006 |
|
$ 850,000,000 |
| Nov 01, 2001 |
|
Undisclosed amount |
| Sep 16, 1998 |
|
$ 88,000,000 |
| Jun 11, 1997 |
|
Undisclosed amount |
