A trader looks at his computer in Saxo bank in Paris on June 24, 2016 after the result of Britain's in-out referendum on EU membership, as Britain voted to leave the European Union. Disbelief and shock hit financial trading rooms on June 24 as Britain voted to leave the European Union in a decision that sparked upheaval across international markets. The pound collapsed to a 31-year low and there was pandemonium on currency, equity and oil markets fuelling a wave of global uncertainty. / AFP PHOTO / Thomas SAMSONTHOMAS SAMSON/AFP/Getty Images

A trader looks at his computer in Saxo bank in Paris on June 24, 2016 after the result of Britain's in-out referendum on EU membership, as Britain voted to leave the European Union. Disbelief and shock hit financial trading rooms on June 24 as Britain voted to leave the European Union in a decision that sparked upheaval across international markets. The pound collapsed to a 31-year low and there was pandemonium on currency, equity and oil markets fuelling a wave of global uncertainty. / AFP PHOTO / Thomas SAMSONTHOMAS SAMSON/AFP/Getty Images

A trader looks at his computer in Saxo bank in Paris on June 24, 2016 after the result of Britain's in-out referendum on EU membership, as Britain voted to leave the European Union. Disbelief and shock hit financial trading rooms on June 24 as Britain voted to leave the European Union in a decision that sparked upheaval across international markets. The pound collapsed to a 31-year low and there was pandemonium on currency, equity and oil markets fuelling a wave of global uncertainty. / AFP PHOTO / Thomas SAMSONTHOMAS SAMSON/AFP/Getty Images

A computer screen shows the Brexit live poll and realtime GBP / HKD rates in Hong Kong on June 24, 2016. Britain has voted to break out of the European Union, national media declared on June 24, striking a thunderous blow against the bloc and spreading alarm through markets as sterling plummeted to a 31-year low against the dollar. / AFP PHOTO / ANTHONY WALLACEANTHONY WALLACE/AFP/Getty Images

JIANGSU PROVINCE, CHINA - JUNE 24: Damaged vehicles and buildings are seen at Funing economic and technological development zone on June 24, 2016, Jiangsu Province of China. Heavy hail and a strong tornado has hit eastern China's Jiangsu province on June 23, which has left at least 98 people dead and some 800 injured, according to local media. (Photo by VCG/VCG via Getty Images)

JIANGSU PROVINCE, CHINA - JUNE 24: Damaged vehicles are seen at Funing economic and technological development zone on June 24, 2016, Jiangsu Province of China. Heavy hail and a strong tornado has hit eastern China's Jiangsu province on June 23, which has left at least 98 people dead and some 800 injured, according to local media. (Photo by VCG/VCG via Getty Images)

(FILES) A file photo taken on March 31, 2014 shows a woman checking a smartphone as she walks along the Han river in Seoul. Tired of endless text messages from boss? Hyper-wired South Korea is mulling a ban on after-hour work messages sent on the country's most popular chat app as many bemoan growing toll on their work-life balance. The so-called "No after-hour work messages on KakaoTalk" -- referring to the chat app used by over 80 percent of the South's 50 million populace -- was proposed by a group of 12 Seoul lawmakers this week. / AFP PHOTO / Ed Jones / To go with AFP story SKorea-smartphone-technology, FOCUS by Jung Ha-WonED JONES/AFP/Getty Images

The British flag is displayed on the facade of the Palace of Culture and Science in Warsaw, Poland, on June 22, 2016. Britons will vote on whether to remain in or leave the European Union (EU) in a referendum on June 23, 2016. / AFP PHOTO / PAP / Jacek TurczykJACEK TURCZYK/AFP/Getty Images