เขาเป็นผู้นำการแข่งขันน้อยที่สุดในปีไหน ?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
in which years did he lead the race the least ?It is not neccessary to use all the tables.
 table_203_339:  id [ number]  "year" [ text]  "car" [ number]  "start" [ number]  "qual" [ number]  "rank" [ number]  "finish" [ number]  "laps" [ number]  "led" [ number]  "retired" [ text] 
SELECT "year" FROM table_203_339 WHERE "led" = (SELECT MIN("led") FROM table_203_339)