The weighted average dollar rate rose RUR 0.04 to RUR 31.59 by the end of today's special trading session. This was the most significant rise since January 9, which was more than a month and a half ago. Experts from commercial banks explained that this noticeable increase in the dollar rate was due to sharply lower sales of dollars. A currency analyst who spoke to an RBC correspondent noted that sales of dollar reduced significantly, in the first place, due to lower sales of export currency revenues. The specialist noted that a comparatively insignificant trade volume on February 25, less than $102m, testified to this tendency. This trade volume was more than $400m less than at the previous unified trading session.