2002, Houston, Texas
2002, Philadelphia, Pennsylvania
2000, Boston, Massachusetts
1997, Philadelphia, Pennsylvania
1995, Atlanta, Georgia
1992, Centennial, Colorado
1991, Richmond, Virginia
1991, Philadelphia, Pennsylvania
1990, Philadelphia, Pennsylvania
1987, Dallas, Texas
1987, Philadelphia, Pennsylvania
1987, Arlington, Virginia
1986, Vienna, Virginia
1986, Dallas, Texas
1985, Arlington, Virginia
1984, Denver, Colorado
1984, Miami, Florida
1984, Dallas, Texas
1984, Abilene, Texas