What was sweden's purse in USD?
CREATE TABLE "winners" (
  "year" real,
  "dates" text,
  "champion" text,
  "country" text,
  "score" real,
  "to_par" text,
  "margin_of_victory" text,
  "purse_us" real,
  "winner_s_share" text
);
SELECT SUM("purse_us") FROM "winners" WHERE "country"='sweden';