How many stolen ends against where there when Thomas Dufour was skip? 
CREATE TABLE "standings" (
  "country" text,
  "skip" text,
  "w" real,
  "l" real,
  "pf" real,
  "pa" real,
  "ends_won" real,
  "ends_lost" real,
  "blank_ends_f_a" text,
  "stolen_ends_for" real,
  "stolen_ends_against" real,
  "shot_pct" real
);
SELECT "stolen_ends_against" FROM "standings" WHERE "skip"='Thomas Dufour';