Exact population: 4,075,261 (July 2006 est.) Literacy: Total population: 96%; male: 95.9%; female: 96.1% Ethnicities: White (including mestizo) 94%, black 3%, Amerindian 1%, Chinese 1%, other 1% Land boundaries: Total: 639 km; border countries: Nicaragua 309 km, Panama 330 km Terrain: Coastal plains separated by rugged mountains including over 100 volcanic cones, of which several are major volcanoes Extremes: Lowest point: Pacific Ocean 0 m; highest point: Cerro Chirripo 3,810 m Imports: US 46.1%, Japan 5.9%, Mexico 5.1%, Brazil 4.2% (2004) Exports: US 46.9%, Netherlands 5.3%, Guatemala 4.4% (2004) Industries: Microprocessors, food processing, textiles and clothing, construction materials, fertilizer, plastic products