OREANDA-NEWS  On 12 December was announced, that the NBU conducted its fourth foreign currency auction, when it sold USD 90.4mn of foreign currency to commercial banks. The average exchange rate was UAH/USD 7.53, while the bids range was UAH/USD 7.44-7.6. Total demand for foreign currency amounted to USD 137.5mn (USD 433.8mn on the previous auction). Overall, the NBU sold USD 290.8mn on the three previous auctions.