Sohn first competed in the 1,500 and 5,000 m, but turned to longer distances after winning an eight-mile race in October 1933. Between 1933 and 1936, he ran 12 marathons; he finished in the top three on all occasions and won nine. On November 3, 1935 in Tokyo, Japan, Sohn set a world record in the marathon with a time of 2:26:42. According to the International Association of Athletics Federations, this record remained unbroken until Sohn's own trainee, Suh Yun-Bok, won the 1947 Boston Marathon.

How many years did his record remain unbroken for?
A: 12

Of the estimated 30,000 to 40,000 people who reached Dawson City during the gold rush, only around 15,000 to 20,000 finally became prospectors. Of these, no more than 4,000 struck gold and only a few hundred became rich. By the time most of the stampeders arrived in 1898, the best creeks had all been claimed, either by the long-term miners in the region, or by the first arrivals of the year before. The Bonanza, Eldorado, Hunker and Dominion Creeks were all taken, with almost 10,000 claims recorded by the authorities by July 1898; a new prospector would have to look further afield to find a claim of his own. Geologically, the region was permeated with veins of gold, forced to the surface by volcanic action and then worn away by the action of rivers and streams, leaving nuggets and gold dust in deposits known as placer gold. Some ores lay along the creek beds in lines of soil, typically 15 feet  to 30 feet  beneath the surface. Others, formed by even older streams, lay along the hilltops; these deposits were called "bench gold". Finding the gold was challenging. Initially, miners had assumed that all the gold would be along the existing creeks, and it was not until late in 1897 that the hilltops began to be mined. Gold was also unevenly distributed in the areas where it was found, which made prediction of good mining sites even more uncertain. The only way to be certain that gold was present was to conduct exploratory digging.

Which gold was found first placer gold or bench gold?
A: placer gold

In recent years, Nanjing has been developing its economy, commerce, industry, as well as city construction. In 2013 the citys GDP was RMB 801 billion (3rd in Jiangsu), and GDP per capita(current price) was RMB 98,174(US$16041), a 11 percent increase from 2012. The average urban residents disposable income was RMB 36,200, while the average rural residents net income was RMB 14,513. The registered urban unemployment rate was 3.02 percent, lower than the national average (4.3 percent). Nanjings Gross Domestic Product ranked 12th in 2013 in China, and its overall competence ranked 6th in mainland and 8th including Taiwan and Hong Kong in 2009.

What year was the GDP per capita higher, 2012 or 2013?
A: