SELECT "winning team" FROM table_204_63 GROUP BY "winning team" ORDER BY COUNT(*) LIMIT 1
which winning team won the least ?
CREATE TABLE table_204_63 (
    id number,
    "round" number,
    "circuit" text,
    "date" text,
    "pole position" text,
    "winning driver" text,
    "winning team" text,
    "trophy winner" text
)