| Date | Acquired | Amount |
|---|---|---|
| Jul 12, 2017 |
|
Undisclosed amount |
| May 22, 2017 |
|
$ 1,740,000,000 |
| Jun 02, 2016 |
|
Undisclosed amount |
| Dec 19, 2014 |
|
Undisclosed amount |
| Sep 16, 2013 |
|
Undisclosed amount |
| Jul 15, 2013 |
|
Undisclosed amount |
| Jan 27, 2012 |
|
Undisclosed amount |
| Jun 16, 2011 |
|
Undisclosed amount |
| Nov 09, 2009 |
|
Undisclosed amount |
| Jul 07, 2009 |
|
Undisclosed amount |
| May 29, 2008 |
|
Undisclosed amount |
| Jun 07, 2006 |
|
Undisclosed amount |
