How many north american brands have world headquarters in sagamihara?
CREATE TABLE "manufacturer_s_worldwide_ranking" (
  "rank" real,
  "company_name" text,
  "2008_rank" text,
  "2009_revenue" text,
  "north_american_brands" text,
  "world_headquarters" text,
  "country" text
);
SELECT COUNT("north_american_brands") FROM "manufacturer_s_worldwide_ranking" WHERE "world_headquarters"='Sagamihara';