Exhibit 21 - Subsidiaries, Form 10-K for 2012

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Filing	Description	Date Filed	Size
FWP	free writing prospectus - filing under securities act rules 163/433	Jun 19, 2008	16.2 KB
FWP	free writing prospectus - filing under securities act rules 163/433	Aug 13, 2010	15.2 KB
FWP	free writing prospectus - filing under securities act rules 163/433	Aug 13, 2010	15.0 KB
FWP	free writing prospectus - filing under securities act rules 163/433	May 18, 2011	35.1 KB
FWP	free writing prospectus - filing under securities act rules 163/433	May 18, 2011	35.4 KB
FWP	free writing prospectus - filing under securities act rules 163/433	May 18, 2011	18.5 KB
FWP	free writing prospectus - filing under securities act rules 163/433	May 18, 2011	18.5 KB
FWP	free writing prospectus - filing under securities act rules 163/433	May 18, 2011	17.8 KB
FWP	free writing prospectus - filing under securities act rules 163/433	May 18, 2011	17.9 KB
FWP	free writing prospectus - filing under securities act rules 163/433	May 19, 2011	34.7 KB
FWP	free writing prospectus - filing under securities act rules 163/433	May 19, 2011	17.6 KB
POS AM	post-effective amendment	Dec 6, 2005	1.4 MB
POS AM	post-effective amendment	Dec 23, 2005	1.4 MB
POS AM	post-effective amendment	Feb 27, 1996	0.0 KB
PRE 14A	preliminary proxy statement	Feb 28, 2006	656.5 KB
S-3	registration statement	Oct 11, 1994	0.0 KB
S-3	registration statement	Dec 11, 2003	253.9 KB
S-3	registration statement	Aug 7, 2001	0.0 KB
S-3	registration statement	Apr 29, 2003	455.3 KB
S-3	registration statement	Nov 19, 1999	0.0 KB
S-3/A	registration statement	Aug 14, 2001	0.0 KB
S-3/A	registration statement	Dec 29, 1999	0.0 KB
S-3ASR	automatic shelf registration statement of securities of well-known seasoned issuers	Feb 28, 2011	285.8 KB
S-3ASR	automatic shelf registration statement of securities of well-known seasoned issuers	Nov 13, 2006	184.8 KB
S-3ASR	automatic shelf registration statement of securities of well-known seasoned issuers	Mar 11, 2008	283.6 KB
S-4	registration statement	Feb 3, 1995	0.0 KB
S-4	registration statement	Jan 10, 2000	0.0 KB
S-4	registration statement	Feb 22, 2001	0.0 KB
S-4	registration statement	Apr 23, 2001	0.0 KB
S-4	registration statement	Aug 13, 2001	0.0 KB
S-4	registration statement	Feb 16, 2005	1.3 MB
S-4	registration statement	Jul 7, 2011	2.6 MB
S-4	registration statement	Jan 23, 1996	0.0 KB
S-4	registration statement	Jun 26, 1997	0.0 KB
S-4	registration statement	Oct 17, 1997	0.0 KB
S-4	registration statement	Sep 7, 1999	0.0 KB
S-4/A	registration statement	Feb 28, 1995	0.0 KB
S-4/A	registration statement	Mar 14, 2001	0.0 KB
S-4/A	registration statement	May 14, 2001	0.0 KB
S-4/A	registration statement	Sep 24, 2001	0.0 KB
S-4/A	registration statement	Oct 19, 2001	0.0 KB
S-4/A	registration statement	Oct 19, 2001	0.0 KB
S-4/A	registration statement	Mar 23, 2005	1.3 MB
S-4/A	registration statement	Oct 27, 2011	2.6 MB
S-4MEF	registration statement	Apr 18, 2001	0.0 KB
S-8	registration statement	Nov 8, 2005	81.9 KB
S-8	registration statement	May 10, 2005	127.8 KB
S-8	registration statement	Dec 18, 2009	29.7 KB
S-8	registration statement	May 1, 2012	70.8 KB
S-8	registration statement	May 3, 2013	1.1 MB