| Date | Acquired | Amount |
|---|---|---|
| Oct 03, 2017 |
|
Undisclosed amount |
| Jun 16, 2017 |
|
$ 310,000,000 |
| Mar 17, 2017 |
|
Undisclosed amount |
| Feb 15, 2017 |
|
$ 51,000,000 |
| Jan 05, 2017 |
|
$ 70,000,000 |
| Aug 08, 2016 |
|
$ 3,000,000,000 |
| Jul 22, 2015 |
|
Undisclosed amount |
| Oct 01, 2013 |
|
Undisclosed amount |
| Nov 29, 2010 |
|
Undisclosed amount |
| Feb 22, 2010 |
|
Undisclosed amount |
| Jan 23, 2009 |
|
Undisclosed amount |
| Sep 01, 2005 |
|
Undisclosed amount |
| Mar 01, 2004 |
|
Undisclosed amount |
| Jan 01, 1999 |
|
Undisclosed amount |
| Jun 04, 1997 |
|
Undisclosed amount |
