CREATE TABLE table_203_498 (id DECIMAL, "first issued" TEXT, "design" TEXT, "slogan" TEXT, "serial format" TEXT, "serials issued" TEXT, "notes" TEXT)

what was the design on the last vehicle registration plates of vermont ?
SELECT "design" FROM table_203_498 ORDER BY "first issued" DESC LIMIT 1
SELECT "design" FROM "table_203_498" ORDER BY "first issued" DESC NULLS LAST LIMIT 1