It has declined by $14 so far this month and by $30 since the beginning of the year.
It is trading at around $250 to the greenback on the black market.
More than 1 300 bids were allotted US$36.8 million at today’s auction with 977 bids from the small and medium enterprise sector getting US$6.6 million. The balance went to 399 large firms.
The lowest offer was $131 and the highest $150.