Exchange rate of the US greenback vis-a-vis the Kuwaiti dinar dropped to KD 0.281 per dollar, as the euro stood at KD 0.388, said the daily exchange rate bulletin of the Central Bank of Kuwait on Thursday. The bulletin said the pound sterling dropped to KD 0.461, the Swiss franc stood at KD 0.317, and the Japanese yen at its long-held notch of KD 0.003.