SELECT "year" FROM table_203_339 WHERE "led" = (SELECT MIN("led") FROM table_203_339)
in which years did he lead the race the least ?
CREATE TABLE table_203_339 (
    id number,
    "year" text,
    "car" number,
    "start" number,
    "qual" number,
    "rank" number,
    "finish" number,
    "laps" number,
    "led" number,
    "retired" text
)