What is the Number of Households that have a Per Capita Income of $21,345?
CREATE TABLE "new_mexico_places_ranked_by_per_capita_i" (
  "rank" real,
  "place" text,
  "county" text,
  "per_capita_income" text,
  "median_house_hold_income" text,
  "median_family_income" text,
  "population" real,
  "number_of_households" real
);
SELECT AVG("number_of_households") FROM "new_mexico_places_ranked_by_per_capita_i" WHERE "per_capita_income"='$21,345';