Sperling

2/1/1997

3/1/1997

4/5/1997

10/23/1998

10/24/1998

4/17/1999

5/22/1999

12/18/2000

3/31/2001

8/3/2001

3/9/2002

4/5/2003

8/29/2003

1/10/2004

10/21/2005

11/26/2005

3/10/2007