Economy1 (Mauritania) ===================== Currency: ouguiya (plural - ouguiya); 1 ouguiya (UM) = 5 khoums Exchange rates: ouguiya (UM) per US$1 - 79.300 (January 1992), 81.946 (1991), 80.609 (1990), 83.051 (1989), 75.261 (1988), 73.878 (1987) Fiscal year: calendar year