What is the average rank of the airport with a 9.3% annual change?
CREATE TABLE "brazil_s_15_busiest_airports_by_passenge" (
  "rank" real,
  "location" text,
  "total_passengers" real,
  "annual_change" text,
  "capacity_in_use" text
);
SELECT AVG("rank") FROM "brazil_s_15_busiest_airports_by_passenge" WHERE "annual_change"='9.3%';