CREATE TABLE table_204_633 (id DECIMAL, "launch date" TEXT, "operator" TEXT, "name" TEXT, "sample origin" TEXT, "samples returned" TEXT, "recovery date" TEXT, "mission result" TEXT)

what year was the first success ?
SELECT MIN("launch date") FROM table_204_633 WHERE "mission result" = 'success'
SELECT MIN("launch date") FROM "table_204_633" WHERE "mission result" = 'success'