How many provinces have a density of 165.81?
CREATE TABLE "list_of_provincial_level_divisions" (
  "gb" text,
  "iso" text,
  "province" text,
  "chinese_name" text,
  "capital" text,
  "population" real,
  "density" text,
  "area" real,
  "abbreviation_symbol" text
);
SELECT COUNT("iso") FROM "list_of_provincial_level_divisions" WHERE "density"='165.81';