what is the highest amount of passengers when there is a rank of 1?
CREATE TABLE "brazil_s_15_busiest_airports_by_passenge" (
  "rank" real,
  "location" text,
  "total_passengers" real,
  "annual_change" text,
  "capacity_in_use" text
);
SELECT MAX("total_passengers") FROM "brazil_s_15_busiest_airports_by_passenge" WHERE "rank"=1;