How many main wins for France?
CREATE TABLE "champions" (
  "season" text,
  "team" text,
  "racing_team" text,
  "chassis" text,
  "engine" text,
  "tyres" text,
  "drivers" text,
  "wins" text,
  "sprints_wins" text,
  "main_wins" text,
  "poles" text,
  "fastest_laps" text,
  "points" text
);
SELECT "main_wins" FROM "champions" WHERE "team"='france';