CREATE TABLE table_204_463 (id DECIMAL, "year" DECIMAL, "division" DECIMAL, "league" TEXT, "regular season" TEXT, "playoffs" TEXT, "open cup" TEXT)

what is the only year that the seattle sounders qualified for the open cup ?
SELECT "year" FROM table_204_463 WHERE "open cup" <> 'did not qualify'
SELECT "year" FROM "table_204_463" WHERE "open cup" <> 'did not qualify'