Question: The Salta-Antofagasta railways passes through a plateau, what percentage of which is in Chile?
Context: Socompa is a large stratovolcano at the border of Argentina and Chile.  Part of the Chilean and Argentine Andean Volcanic Belt (AVB), it is part of the Central Volcanic Zone, one of the various segments of the AVB.  This part of the Andean volcanic arc begins in Peru and runs first theough Bolivia and Chile and then through Argentina and Chile, and contains about 44 active volcanoes.  Socompa lies close to the pass of the same name, where the Salta-Antofagasta railway crosses the border. The Puna de Atacama or Atacama Plateau is an arid high plateau, in the Andes of northern Chile (15%) and Argentina (85%).  Geomorphologist Walther Penck based his "Grossfalt" landform association on Puna de Atacama. The Western Railway is one of the 17 zones of Indian Railways, and is among the busiest railway networks in India.  The major railway routes of Indian Railways which come under Western Railways are: Mumbai Central - Ratlam, Mumbai Central - Ahmedabad and Palanpur - Ahmedabad.  The railway system is divided into six operating divisions: Vadodara, Ahmedabad, Rajkot, Bhavnagar, Ratlam and Mumbai.  Vadodara railway station, being the junction point for the Ahmedabad - Mumbai route and the Mumbai - Ratlam route towards New Delhi, is the busiest junction Station in Western Railways and one of the busiest junctions of Indian Railways too, while Ahmedabad Division earns highest revenue followed by Mumbai Division and Vadodara Division.  Surat railway station is one of the busiest railway station in Western Railway in non-junction category where more than 160 trains passes per day. The Thompson Plateau, also known as the Okanagan-Thompson Plateau, forms the southern portion of the Interior Plateau of British Columbia, Canada, lying to the west of Okanagan Lake, south of the Thompson River and to the east of (although never adjoining it) the Fraser River.  At its most southern point the plateau is squeezed by the mountainous terrain of the Cascade Range abutting closer to the Okanagan Valley.  Its southwestern edge abuts the Canadian Cascades portion of that extensive range, more or less following the line of the Similkameen River, its tributary the Tulameen River, and a series of passes from the area of Tulameen, British Columbia to the confluence of the Thompson River with the Nicoamen River, a few miles east of Lytton, British Columbia, which is in the Fraser Canyon.  Its northeastern edge runs approximately from the city of Vernon, British Columbia through the valley of Monte Creek to the junction of the same name just east of the city of Kamloops.  Northeast of that line is the Shuswap Highland. Obesity in Chile is a growing health concern with health officials stating that it is one of the leading causes of preventable deaths in the Chile.  According to Forbes, Chile ranks 23 on a 2007 list of fattest countries with a percentage of 65.3% of its citizens with an unhealthy weight. Chilevisión is the third oldest Chilean television network.  Formerly called "Canal 9 de Televisión de la Universidad de Chile", "Teleonce (Universidad de Chile Televisión)" and "RTU (Red de Televisión de la Universidad de Chile"), this TV station was owned by Universidad de Chile, a Chilean state university.  This educational institution sold a significant percentage of its TV channel to Venevisión, changing its name to "Chilevisión".  It was later sold to "Claxson Interactive Group" and then to Chilean investor and ex-president Sebastián Piñera. This is a list of German companies by employees in 1907.  The largest 127 companies of the German Empire in 1907 accounted for 7.8 percent of all employees in the German Empire; excluding railways and state-owned enterprises the share was only 3.6 percent.  This compares to corresponding percentage shares of 8.2 respectively 4.6 for the United Kingdom at the same time.  The largest German companies were predominantly in the heavy industries (mining, coal, iron, iron ore, steel and metals), accounting for 38.7 percent of all employees and the transport and communication sector (railways, postal service, shipping), accounting for 45.4 percent of all employees.  State-owned enterprises such as the state railways companies, the postal administration, the Prussian state mines, military workshops and the Imperial shipyards are dominant among the very largest companies. The Altiplano (Spanish for "high plain"), Collao (Quechua and Aymara: Qullaw, meaning "place of the Qulla"), Andean Plateau or Bolivian Plateau, in west-central South America, is the area where the Andes are the widest.  It is the most extensive area of high plateau on Earth outside Tibet.  The bulk of the Altiplano lies in Bolivia, but its northern parts lie in Peru, and its southern parts lie in Chile and Argentina. The Salta–Antofagasta railway, also named Huaytiquina, is a non-electrified single track railway line that links Argentina and Chile passing through the Andes.  It is a railway with a total length of 941 km (571 in Argentina and 330 in Chile), connecting the city of Salta (Argentina) to the one of Antofagasta (Chile), on the Pacific Ocean, passing through the Puna de Atacama and Atacama Desert. Transport in Chile is mostly by road.  The south of the country is not connected to central Chile by road, except through Argentina, and water transport also plays a part there.  The railways were historically important in Chile, but now play a relatively small part in the country's transport system.  Because of the country's geography and long distances between major cities, aviation is also important.
Answer: 15%