what percentage is brooklyn when manhattan is 15.5%?
CREATE TABLE "general_election" (
  "2009_general_election" text,
  "party" text,
  "manhattan" text,
  "the_bronx" text,
  "brooklyn" text,
  "queens" text,
  "staten_island" text,
  "total" real,
  "pct" text
);
SELECT "brooklyn" FROM "general_election" WHERE "manhattan"='15.5%';