CREATE TABLE table_203_379 (id DECIMAL, "first issued" TEXT, "design" TEXT, "slogan" TEXT, "serial format" TEXT, "serials issued" TEXT, "notes" TEXT)

what year was the last license plate issued ?
SELECT "first issued" FROM table_203_379 ORDER BY "first issued" DESC LIMIT 1
SELECT "first issued" FROM "table_203_379" ORDER BY "first issued" DESC NULLS LAST LIMIT 1