CREATE TABLE "nationalities_of_foreign_born_winners" (
  "rank" real,
  "nation" text,
  "national_wins" real,
  "drivers" text,
  "driver_wins" real
);

Question: What is the average number of wins of drivers from Sweden?
SQL: SELECT AVG("driver_wins") FROM "nationalities_of_foreign_born_winners" WHERE "nation"='sweden';