What is the average for the year 2008 of the team that in 2010 had an average of 240,735 with rank lower than 5?
CREATE TABLE "passenger_statistics" (
  "rank" real,
  "airport" text,
  "city" text,
  "code_iata_icao" text,
  "2008" real,
  "2009" real,
  "2010" real
);
SELECT AVG("2008") FROM "passenger_statistics" WHERE "2010"='240,735' AND "rank"<5;