German Chancellor Angela Merkel (R) and German Vice Chancellor, Economy and Energy Minister Sigmar Gabriel share a smile during a session of the Bundestag (lower house of parliament) on September 8, 2016 in Berlin. / AFP PHOTO / dpa / Wolfgang Kumm / Germany OUTWOLFGANG KUMM/AFP/Getty Images

German Vice Chancellor, Economy and Energy Minister Sigmar Gabriel gestures as he gives a speech during a session of the Bundestag (lower house of parliament) on September 8, 2016 in Berlin. / AFP PHOTO / dpa / Wolfgang Kumm / Germany OUTWOLFGANG KUMM/AFP/Getty Images

German Vice Chancellor, Economy and Energy Minister Sigmar Gabriel gives a speech during a session of the Bundestag (lower house of parliament) on September 8, 2016 in Berlin. / AFP PHOTO / dpa / Wolfgang Kumm / Germany OUTWOLFGANG KUMM/AFP/Getty Images

Border guards are on patrol at a port in Qingdao, east China's Shandong province on September 8, 2016. China's imports rose 1.5 percent year-on-year in August, figures showed Thursday, the first increase in nearly two years, in a positive sign for the world's second-largest economy. / AFP PHOTO / STR / China OUTSTR/AFP/Getty Images

A truck transports containers at a port in Qingdao, east China's Shandong province on September 8, 2016. China's imports rose 1.5 percent year-on-year in August, figures showed Thursday, the first increase in nearly two years, in a positive sign for the world's second-largest economy. / AFP PHOTO / STR / China OUTSTR/AFP/Getty Images

Trucks transport containers at a port in Qingdao, east China's Shandong province on September 8, 2016. China's imports rose 1.5 percent year-on-year in August, figures showed Thursday, the first increase in nearly two years, in a positive sign for the world's second-largest economy. / AFP PHOTO / STR / China OUTSTR/AFP/Getty Images

Chinese workers load steel pipes at a port in Lianyungang in east China's Jiangsu province on September 8, 2016. China's imports rose 1.5 percent year-on-year in August, figures showed Thursday, the first increase in nearly two years, in a positive sign for the world's second-largest economy. / AFP PHOTO / STR / China OUTSTR/AFP/Getty Images

Trucks transport containers at a port in Qingdao, east China's Shandong province on September 8, 2016. China's imports rose 1.5 percent year-on-year in August, figures showed Thursday, the first increase in nearly two years, in a positive sign for the world's second-largest economy. / AFP PHOTO / STR / China OUTSTR/AFP/Getty Images