What is the highest Number of seasons in Liga MX for Club cruz azul, when their season in the top division is higher than 68?
CREATE TABLE "clubs" (
  "club" text,
  "first_season_in_top_division" text,
  "number_of_seasons_in_top_division" real,
  "first_season_of_current_spell_in_top_division" text,
  "number_of_seasons_in_liga_mx" real,
  "top_division_titles" real
);
SELECT MAX("number_of_seasons_in_liga_mx") FROM "clubs" WHERE "club"='cruz azul' AND "number_of_seasons_in_top_division">68;