When within the walls is larger than 56174.0 what is the lowest amount without the walls?
CREATE TABLE "table1_16677738_1" (
  "year" real,
  "edmonton_hundred" real,
  "elthorne_hundred" real,
  "gore_hundred" real,
  "isleworth_hundred" real,
  "holborn_division" real,
  "finsbury_division" real,
  "kensington_division" real,
  "tower_division" real,
  "spelthorne_hundred" real,
  "within_the_walls" real,
  "without_the_walls" real,
  "inns_of_court_and_chancery" real,
  "westminster_city_and_liberty" real,
  "total" real
);
SELECT MIN("without_the_walls") FROM "table1_16677738_1" WHERE "within_the_walls">56174.0;