How many countries played in the city of ljungskile?
CREATE TABLE "table1_28005160_2" (
  "sponsored_name" text,
  "non_sponsored_name" text,
  "sponsor" text,
  "stadium" text,
  "city" text,
  "country" text,
  "sport" text,
  "sponsorship_ended" real
);
SELECT COUNT("country") FROM "table1_28005160_2" WHERE "city"='Ljungskile';