What is the highest amount of swedish championship titles for the team that was introduced before 2006?
CREATE TABLE "honoured_clubs" (
  "club" text,
  "swedish_championship_titles" real,
  "allsvenskan_titles" real,
  "introduced" real,
  "stars_symbolizes" text
);
SELECT MAX("swedish_championship_titles") FROM "honoured_clubs" WHERE "introduced"<2006;