What is 1989, when 1982 is "SF"?
CREATE TABLE "singles_performance_timeline" (
  "tournament" text,
  "1978" text,
  "1979" text,
  "1980" text,
  "1982" text,
  "1983" text,
  "1984" text,
  "1985" text,
  "1986" text,
  "1987" text,
  "1988" text,
  "1989" text,
  "1990" text,
  "1991" text,
  "1992" text,
  "career_sr" text
);
SELECT "1989" FROM "singles_performance_timeline" WHERE "1982"='sf';