What is the highest 1985 value that has a 1990 value of 93?
CREATE TABLE "provincial_percentage_share_of_average_c" (
  "year" text,
  "2010" real,
  "2009" real,
  "2008" real,
  "2005" real,
  "2000" real,
  "1995" real,
  "1990" real,
  "1985" real
);
SELECT MAX("1985") FROM "provincial_percentage_share_of_average_c" WHERE "1990"=93;