1990 Jan-Mar, 1990 April-June, 1990 July-Sept, 1990 Oct-Dec, 1991 Jan-March, 1991 April-June, 1991 July-Sept, 1991 Oct-Dec, 1992 Jan-March, 1992 April-June, 1992 July-Sept, 1992 Oct-Dec, 1993 Jan-March, 1993 April-June, 1993 July-Sept, 1993 Oct-Dec, 1994 Jan-March, 1994 April-June, 1994 July-Sept, 1994 Oct-Dec