In the first half of this morning's session on US currency the weighted average dollar exchange rate amounted to 31.38 RUR/USD. It means it has not changed for the tenth day in a row since March 21. The growth in the dollar rate at today's UTS is hindered by sales of export currency revenues by commercial banks. The dollar supply has remained pretty large due to growing world oil prices and the new strengthening of the Euro against the dollar. On the other side, the Russian Central Bank has continued preventing the dollar from a decrease by making considerable ruble interventions on the special session.