CREATE TABLE table_204_880 (id DECIMAL, "year" DECIMAL, "competition" TEXT, "venue" TEXT, "position" TEXT, "event" TEXT, "notes" TEXT)

what was the only year the venue was in japan ?
SELECT "year" FROM table_204_880 WHERE "venue" = 'japan'
SELECT "year" FROM "table_204_880" WHERE "venue" = 'japan'