Exchange rate of the US greenback vis-a-vis the Kuwaiti dinar was down at KD 0.280 per dollar, while the euro increased to KD 0.390, compared to Thursday's exchange rates, said the daily exchange rate bulletin of the Central Bank of Kuwait on Sunday. The bulletin said the pound sterling was down at KD 0.470 and the Swiss franc is up to KD 0.320 while the Japanese yen stood at 0.002