Chinese Premier Li Keqiang (L) and Colombian President Juan Manuel Santos (C) applaud Chinese Nobel Prize Laureate for Literature Mo Yan during a literary event in Bogota May 22, 2015. REUTERS/John Vizcaino

Colombian President Juan Manuel Santos (L) shakes hands With Chinese Nobel Prize Laureate for Literature Mo Yan during a literary event in Bogota May 22, 2015. REUTERS/John Vizcaino

2012 Nobel Prize Laureate for Literature Mo Yan (1st L), who is also a delegate, sits together with other delegates as they attend the opening ceremony of National People's Congress (NPC) at the Great Hall of the People in Beijing, March 5, 2013. REUTERS/Jason Lee (CHINA - Tags: POLITICS MEDIA)

A delegate yawns as 2012 Nobel Prize Laureate for Literature Mo Yan (top, 2nd R), who is also a delegate, sits together with other delegates as they listen to China's Premier Wen Jiabao's speech during the opening ceremony of National People's Congress (NPC) at the Great Hall of the People in Beijing, March 5, 2013. REUTERS/Jason Lee (CHINA - Tags: POLITICS MEDIA TPX IMAGES OF THE DAY)

Mo Yan, 2012 Nobel Prize Laureate for Literature, who is also a delegate, is surrounded by reporters outside the Great Hall of the People, the venue of Chinese People's Political Consultative Conference (CPPCC) in Beijing March 3, 2013. REUTERS/Stringer (CHINA - Tags: POLITICS MEDIA)

Mo Yan, 2012 Nobel Prize Laureate for Literature, who is also a delegate, arrives for the opening ceremony of Chinese People's Political Consultative Conference (CPPCC) in Beijing March 3, 2013. REUTERS/Carlos barria (CHINA - Tags: POLITICS MEDIA TPX IMAGES OF THE DAY)

Chinese writer Mo Yan takes a lift down after a news conference in his hometown of Gaomi, Shandong province October 12, 2012. Chinese Nobel Literature Prize winner Mo Yan said on Friday he hoped jailed compatriot Liu Xiaobo, who won the Nobel Peace Prize two years ago, would be freed soon. REUTERS/Jason Lee (CHINA - Tags: SOCIETY POLITICS)

Chinese writer Mo Yan gestures before the start of a news conference in his hometown of Gaomi, Shandong province October 12, 2012. Chinese Nobel Literature Prize winner Mo Yan said on Friday that he hoped the jailed 2010 Nobel Peace Prize winner, Liu Xiaobo, can "achieve freedom soon". REUTERS/Jason Lee (CHINA - Tags: SOCIETY POLITICS)

Chinese writer Mo Yan gestures during a news conference in his hometown of Gaomi, Shandong province October 12, 2012. Chinese Nobel Literature Prize winner Mo Yan said on Friday that he hoped the jailed 2010 Nobel Peace Prize winner, Liu Xiaobo, can "achieve freedom soon". REUTERS/Jason Lee (CHINA - Tags: SOCIETY POLITICS)

Chinese writer Mo Yan speaks to members of the media during a news conference in his hometown of Gaomi, Shandong province October 12, 2012. Chinese Nobel Literature Prize winner Mo said on Friday that he hoped the jailed 2010 Nobel Peace Prize winner, Liu Xiaobo, can "achieve freedom soon". REUTERS/Jason Lee (CHINA - Tags: SOCIETY POLITICS)

Chinese writer Mo Yan speaks to members of the media during a news conference in his hometown of Gaomi, Shandong province October 12, 2012. Chinese Nobel Literature Prize winner Mo said on Friday that he hoped the jailed 2010 Nobel Peace Prize winner, Liu Xiaobo, can "achieve freedom soon". REUTERS/Jason Lee (CHINA - Tags: SOCIETY HEADSHOT POLITICS)

Chinese writer Mo Yan gestures during a news conference in his hometown of Gaomi, Shandong province October 12, 2012. Mo won the 2012 Nobel prize for literature on Thursday for works which combine "hallucinatory realism" with folk tales, history and contemporary life in China. REUTERS/Jason Lee (CHINA - Tags: SOCIETY PROFILE HEADSHOT)

Chinese writer Mo Yan waits for the start of a news conference in his hometown of Gaomi, Shandong province October 12, 2012. Mo won the 2012 Nobel prize for literature on Thursday for works which combine "hallucinatory realism" with folk tales, history and contemporary life in China. REUTERS/Jason Lee (CHINA - Tags: SOCIETY)

Chinese writer Mo Yan arrives for a news conference in his hometown of Gaomi, Shandong province October 12, 2012. Mo won the 2012 Nobel prize for literature on Thursday for works which combine "hallucinatory realism" with folk tales, history and contemporary life in China. REUTERS/Jason Lee (CHINA - Tags: SOCIETY PROFILE)

Chinese writer Mo Yan arrives for a news conference in his hometown of Gaomi, Shandong province October 12, 2012. Mo won the 2012 Nobel prize for literature on Thursday for works which combine "hallucinatory realism" with folk tales, history and contemporary life in China. REUTERS/Jason Lee (CHINA - Tags: SOCIETY PROFILE)

A bedroom is pictured at Chinese writer Mo Yan's childhood home, which is no longer occupied, at Pinganzhuang village, in Gaomi Shandong province, October 12, 2012. Mo won the 2012 Nobel prize for literature on October 11, 2012, for works which combine "hallucinatory realism" with folk tales, history and contemporary life in China. Mo, who was once so destitute he ate tree bark and weeds to survive, is the first Chinese national to win the $1.2 million literature prize, awarded by the Swedish Academy. REUTERS/Jason Lee (CHINA - Tags: POLITICS SOCIETY MEDIA TPX IMAGES OF THE DAY)

Guan Yifan, 90, the father of Chinese writer Mo Yan, smiles during an interview with Reuters in front of Mo's childhood home at Pinganzhuang village, in Gaomi Shandong province, October 12, 2012. Mo won the 2012 Nobel prize for literature on October 11, 2012, for works which combine "hallucinatory realism" with folk tales, history and contemporary life in China. Mo, who was once so destitute he ate tree bark and weeds to survive, is the first Chinese national to win the $1.2 million literature prize, awarded by the Swedish Academy. REUTERS/Jason Lee (CHINA - Tags: POLITICS SOCIETY MEDIA)

Guan Yifan, 90, the father of Chinese writer Mo Yan, stands next to a window after an interview with Reuters in front of Mo's childhood home at Pinganzhuang village, in Gaomi Shandong province, October 12, 2012. Mo won the 2012 Nobel prize for literature on October 11, 2012, for works which combine "hallucinatory realism" with folk tales, history and contemporary life in China. Mo, who was once so destitute he ate tree bark and weeds to survive, is the first Chinese national to win the $1.2 million literature prize, awarded by the Swedish Academy. REUTERS/Jason Lee (CHINA - Tags: POLITICS MEDIA SOCIETY)

Guan Yifan, 90, the father of Chinese writer Mo Yan, holds crops as he walks into a yard of Mo's childhood home at Pinganzhuang village, in Gaomi Shandong province, October 12, 2012. Mo won the 2012 Nobel prize for literature on October 11, 2012, for works which combine "hallucinatory realism" with folk tales, history and contemporary life in China. Mo, who was once so destitute he ate tree bark and weeds to survive, is the first Chinese national to win the $1.2 million literature prize, awarded by the Swedish Academy. REUTERS/Jason Lee (CHINA - Tags: POLITICS SOCIETY MEDIA)

Guan Yifan, 90, the father of Chinese writer Mo Yan, puts on his coat after an interview with Reuters in front of Mo's childhood home at Pinganzhuang village, in Gaomi Shandong province, October 12, 2012. Mo won the 2012 Nobel prize for literature on October 11, 2012, for works which combine "hallucinatory realism" with folk tales, history and contemporary life in China. Mo, who was once so destitute he ate tree bark and weeds to survive, is the first Chinese national to win the $1.2 million literature prize, awarded by the Swedish Academy. REUTERS/Jason Lee (CHINA - Tags: POLITICS MEDIA SOCIETY)

Books of Chinese writer Mo Yan are on display during the book fair in Frankfurt, October 11, 2012. Mo Yan won the 2012 Nobel prize for literature on October 11, 2012 for works which the awarding committee said had qualities of "hallucinatory realism". The world's largest book fair runs from October 9 to October 14 and features the literature of New Zealand as its guest of honour. REUTERS/Ralph Orlowski (GERMANY - Tags: MEDIA SOCIETY)

Books of Chinese writer Mo Yan are on display during the book fair in Frankfurt, October 11, 2012. Mo Yan won the 2012 Nobel prize for literature on October 11, 2012 for works which the awarding committee said had qualities of "hallucinatory realism". The world's largest book fair runs from October 9 to October 14 and features the literature of New Zealand as its guest of honour. REUTERS/Ralph Orlowski (GERMANY - Tags: MEDIA SOCIETY)

Books of Chinese writer Mo Yan are on display during the book fair in Frankfurt, October 11, 2012. Mo Yan won the 2012 Nobel prize for literature on October 11, 2012 for works which the awarding committee said had qualities of "hallucinatory realism". The world's largest book fair runs from October 9 to October 14 and features the literature of New Zealand as its guest of honour. REUTERS/Ralph Orlowski (GERMANY - Tags: MEDIA SOCIETY)

Books of Chinese writer Mo Yan are on display during the book fair in Frankfurt, October 11, 2012. Mo Yan won the 2012 Nobel prize for literature on October 11, 2012 for works which the awarding committee said had qualities of "hallucinatory realism". The world's largest book fair runs from October 9 to October 14 and features the literature of New Zealand as its guest of honour. REUTERS/Ralph Orlowski (GERMANY - Tags: MEDIA SOCIETY)

Photographers take pictures of books written by Chinese writer Mo Yan during the book fair in Frankfurt, October 11, 2012. Mo Yan won the 2012 Nobel prize for literature on October 11, 2012 for works which the awarding committee said had qualities of "hallucinatory realism". The world's largest book fair runs from October 9 to October 14 and features the literature of New Zealand as its guest of honour. REUTERS/Ralph Orlowski (GERMANY - Tags: MEDIA SOCIETY)

Books of Chinese writer Mo Yan are on display during the book fair in Frankfurt, October 11, 2012. Mo Yan won the 2012 Nobel prize for literature on October 11, 2012 for works which the awarding committee said had qualities of "hallucinatory realism". The world's largest book fair runs from October 9 to October 14 and features the literature of New Zealand as its guest of honour. REUTERS/Ralph Orlowski (GERMANY - Tags: MEDIA SOCIETY)

Workers from the Freeport-McMoRan's Grasberg mine wait for a bus after ending their four-day walkout in the town of Timika, in Indonesia's Papua province April 22, 2007. Thousands of workers headed back to Freeport-McMoRan's Grasberg mine in Indonesia on Sunday in a fleet of buses after ending a four-day walkout that sent copper prices to seven-month highs. REUTERS/Yan Rafsanjani (INDONESIA)

Worker from Freeport-McMoRan's Grasberg mine laugh after ending a four-day walkout at the town of Timika in Indonesia's Papua province April 22, 2007. Freeport had agreed to increase the standard monthly salary to 3.1 million rupiah ($341) from 1.5 million rupiah. REUTERS/Yan Rafsanjani (INDONESIA)

Police guard workers from Freeport's-McMoRan's Grasberg mine during the third day of protests in the town of Timika in Papua province April 20, 2007. The protesters are ready to stay away from their jobs for a month if their demands for better welfare are not met, the head of a workers' group said on Friday. REUTERS/Yan Rafsanjani (INDONESIA)

Workers from Freeport-McMoRan's Grasberg mine shout slogans as they continue a second day of protests in the town of Timika in Indonesia's Papua province April 19, 2007. Authorities beefed up security on Thursday as thousands of workers from Freeport-McMoRan's Grasberg mine rallied to demand better welfare. REUTERS/Yan Rafsanjani (INDONESIA)

Workers from Freeport's-McMoRan's Grasberg mine shout slogans as they continue a second day of protests in the town of Timika in Indonesia's Papua province April 19, 2007. Authorities beefed up security on Thursday as thousands of workers from Freeport-McMoRan's Grasberg mine rallied to demand better welfare. REUTERS/Yan Rafsanjani (INDONESIA)

Workers from Freeport's-McMoRan's Grasberg mine shout slogans as they continue a second day of protests in the town of Timika in Indonesia's Papua province April 19, 2007. Authorities beefed up security on Thursday as thousands of workers from Freeport-McMoRan's Grasberg mine rallied to demand better welfare. REUTERS/Yan Rafsanjani (INDONESIA)

Workers from Freeport's-McMoRan's Grasberg mine continue a second day of protests in the town of Timika in Indonesia's Papua province April 19, 2007. Authorities beefed up security on Thursday as thousands of workers from Freeport-McMoRan's Grasberg mine rallied to demand better welfare. REUTERS/Yan Rafsanjani (INDONESIA)

Workers from Freeport's-McMoRan's Grasberg mine shout slogans as they continue a second day of protests in the town of Timika in Indonesia's Papua province April 19, 2007. Authorities beefed up security on Thursday as thousands of workers from Freeport-McMoRan's Grasberg mine rallied to demand better welfare. REUTERS/Yan Rafsanjani (INDONESIA)

Workers from Freeport's-McMoRan's Grasberg mine continue a second day of protest in the town of Timika of Indonesia's Papua province April 19, 2007. Authorities beefed up security on Thursday as thousands of workers from Freeport-McMoRan's Grasberg mine rallied to demand better welfare. REUTERS/Yan Rafsanjani (INDONESIA)

Workers from Freeport's-McMoRan's Grasberg mine continue a second day of protest in the town of Timika of the Indonesia's Papua province April 19, 2007. Authorities beefed up security on Thursday as thousands of workers from Freeport-McMoRan's Grasberg mine rallied to demand better welfare. REUTERS/Yan Rafsanjani (INDONESIA)

Workers from Freeport's-McMoRan's Grasberg mine protest in the town of Timika in Indonesia's Papua province April 18, 2007. Mining activities at Freeport-McMoRan's Grasberg mine have halted after thousands of workers attended a rally over a labour dispute, an official at the workers' group told Reuters on Wednesday. REUTERS/Yan Rafsanjani (INDONESIA

Workers from Freeport's-McMoRan's Grasberg mine sing songs and play music during a protest in the town of Timika in Indonesia's Papua province April 18, 2007. Mining activities at Freeport-McMoRan's Grasberg mine have halted after thousands of workers attended a rally over a labour dispute, an official at the workers' group told Reuters on Wednesday. REUTERS/Yan Rafsanjani (INDONESIA)

Workers from Freeport's-McMoRan's Grasberg mine protest in the town of Timika in Indonesia's Papua province April 18, 2007. Mining activities at Freeport-McMoRan's Grasberg mine have halted after thousands of workers attended a rally over a labour dispute, an official at the workers' group told Reuters on Wednesday. REUTERS/Yan Rafsanjani (INDONESIA)

Workers from Freeport-McMoRan's Grasberg mine protest in the town of Timika April 18, 2007. Mining activities at Freeport-McMoRan's Grasberg mine have halted after thousands of workers attended a rally over a labour dispute, an official at the workers' group told Reuters on Wednesday. REUTERS/Yan Rafsanjani (INDONESIA)

Workers from Freeport-McMoRan's Grasberg mine protest in the town of Timika April 18, 2007. Mining activities at Freeport-McMoRan's Grasberg mine have halted after thousands of workers attended a rally over a labour dispute, an official at the workers' group told Reuters on Wednesday. REUTERS/Yan Rafsanjani (INDONESIA)

Workers from Freeport-McMoRan's Grasberg mine protest in the town of Timika April 18, 2007. Mining activities at Freeport-McMoRan's Grasberg mine have halted after thousands of workers attended a rally over a labour dispute, an official at the workers' group told Reuters on Wednesday. REUTERS/Yan Rafsanjani (INDONESIA)