_#_Exchange rates: Iranian rials (IR) per US$1—64.941 (January 1991), 68.096 (1990), 72.015 (1989), 68.683 (1988), 71.460 (1987), 78.760 (1986), 91.052 (1985) at the official rate; black market rate 1,400 (January 1991)
_#_Fiscal year: 21 March-20 March
_*Communications #_Railroads: 4,601 km total; 4,509 km 1.432-meter gauge, 92 km 1.676-meter gauge; 730 km under construction from Bafq to Bandar Abbas
_#_Highways: 140,072 km total; 46,866 km gravel and crushed stone; 49,440 km improved earth; 42,566 km bituminous and bituminous-treated surfaces; 1,200 km (est.) rural road network
_#_Inland waterways: 904 km; the Shatt al Arab is usually navigable by maritime traffic for about 130 km, but closed since September 1980 because of Iran-Iraq war
_#_Pipelines: crude oil, 5,900 km; refined products, 3,900 km; natural gas, 3,300 km
_#_Ports: Abadan (largely destroyed in fighting during 1980-88 war), Bandar Beheshti, Bandar-e Abbas, Bandar-e Bushehr, Bandar-e Khomeyni, Bandar-e Shahid Rajai, Khorramshahr (largely destroyed in fighting during 1980-88 war)
_#_Merchant marine: 133 ships (1,000 GRT or over) totaling 4,634,204 GRT/8,671,769 DWT; includes 36 cargo, 6 roll-on/roll-off cargo, 33 petroleum, oils, and lubricants (POL) tanker, 4 chemical tanker, 3 refrigerated cargo, 49 bulk, 2 combination bulk
_#_Civil air: 42 major transport aircraft
_#_Airports: 214 total, 186 usable; 80 with permanent-surface runways; 17 with runways over 3,659 m; 16 with runways 2,440-3,659 m; 70 with runways 1,220-2,439 m