CREATE TABLE table_203_340 (id DECIMAL, "rank" DECIMAL, "airport" TEXT, "passengers handled" DECIMAL, "% change 2011 / 12" DECIMAL)

looking at the top 10 busiest routes to and from london southend airport what is the average number of passengers handled ?
SELECT AVG("passengers handled") FROM table_203_340
SELECT AVG("passengers handled") FROM "table_203_340"