| Date Filed | Type | Description |
| 02/29/2012 |
10-K
| Annual Report for the period ended December 31, 2011 |
| 02/28/2011 |
10-K
| Annual Report for the period ended December 31, 2010 |
| 03/01/2010 |
10-K
| Annual Report for the period ended December 31, 2009 |
| 02/26/2009 |
10-K
| Annual Report for the period ended December 31, 2008 |
| 02/28/2008 |
10-K
| Annual Report for the period ended December 31, 2007 |
| 02/28/2007 |
10-K
| Annual Report for the period ended December 31, 2006 |
| 03/24/2006 |
10-K
| Annual Report for the period ended December 31, 2005 |
| 03/16/2005 |
10-K
| Annual Report for the period ended December 31, 2004 |
| 06/04/2004 |
10-K/A
| Annual Report for the period ended December 31, 2003 [amend] |
| 04/28/2004 |
10-K/A
| Annual Report for the period ended December 31, 2003 [amend] |
| 03/04/2004 |
10-K
| Annual Report for the period ended December 31, 2003 |
| 03/17/2003 |
10-K/A
| Annual Report for the period ended December 31, 2002 [amend] |
| 02/28/2003 |
10-K
| Annual Report for the period ended December 31, 2002 |
| 03/21/2002 |
10-K
| Annual Report for the period ended December 31, 2001 |
| 03/21/2001 |
10-K
| Annual Report for the period ended December 31, 2000 |
| 03/23/2000 |
10-K
| Annual Report for the period ended December 31, 1999 |
| 03/26/1999 |
10-K/A
| Annual Report for the period ended December 31, 1998 [amend] |
| 03/23/1999 |
10-K
| Annual Report for the period ended December 31, 1998 |
| 04/20/1998 |
10-K/A
| Annual Report for the period ended December 31, 1997 [amend] |
| 03/27/1998 |
10-K
| Annual Report for the period ended December 31, 1997 |
| 03/31/1997 |
10-K
| Annual Report for the period ended December 31, 1996 |