| Date | Acquired | Amount |
|---|---|---|
| Nov 15, 2017 |
|
$ 100,000,000 |
| Dec 22, 2009 |
|
Undisclosed amount |
| Dec 11, 2009 |
|
$ 470,000,000 |
| Jun 16, 2009 |
|
$ 40,000,000 |
| Jun 01, 2009 |
|
Undisclosed amount |
| Sep 02, 2008 |
|
$ 300,000,000 |
| Jan 22, 2007 |
|
Undisclosed amount |
| Jan 30, 2005 |
|
$ 54,000,000,000 |
| Mar 18, 2003 |
|
$ 5,900,000,000 |
| Nov 16, 2001 |
|
$ 4,950,000,000 |
| Oct 08, 1999 |
|
Undisclosed amount |
| Jul 01, 1997 |
|
Undisclosed amount |
| Jul 27, 1994 |
|
$ 150,000,000 |
| Nov 30, 1989 |
|
$ 1,300,000,000 |
| Jan 01, 1985 |
|
Undisclosed amount |
| Jan 01, 1963 |
|
Undisclosed amount |
| Jan 01, 1930 |
|
Undisclosed amount |
