1977 - January-March
1981 - March
1982 - January, June
1983 - March, July, December
1984 - June, September, December
1985 - December
1986 - April, June (2nd quarter), December
1987 - June/December (2nd & 3rd quarters)
1988 - April, September, December
1989 - January/March, April/June, September/December
1990 - September/December
1991 - April/June, July/September, October/December
1992 - April-June, July-October
1993 - July-October
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