Which company name has a 2008 rank of n/a?
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("company_name") FROM "manufacturer_s_worldwide_ranking" WHERE "2008_rank"='N/A';