South Sudan, with a little over a quarter, has the next-biggest proportion, the agency said.
For all of 2016, the UNHCR reported that a total of 65.6 million people worldwide had been displaced from their homes during the year. Turkey hosted the most refugees with 2.9 million people.
Have you read Trendiee Today? The total "means that on average, one in every 113 people worldwide is today someone who is displaced", said Filippo Grandi, the United Nations high commissioner for refugees.
"Forced Displacements in 2016", released by the Office of the UN High Commissioner for Refugees (UNHCR) says that 20 people are newly displaced every minute or one person every three seconds. This equates to one person becoming displaced every 3 seconds.
"By any measure this is an unacceptable number, and it speaks louder than ever to the need for solidarity and common objective in preventing and resolving crises, and ensuring together that the world's refugees, internally displaced and asylum seekers are properly protected and cared for while solutions are pursued", said UN High Commissioner for Refugees Filippo Grandi. Five million have fled to neighboring countries and Europe, while the rest remain inside Syria, officially labeled as displaced persons.More news: Warmbier Death Pushes Potential Trump-Kim Meeting 'Further Away'
UNICEF in Uganda requires almost $50 million in 2017 as well as $30 million each year from 2018 to 2020 to provide critical services, including education and child protection, to both refugees and host communities, the UNICEF statement said.
A $15 million humanitarian aid package will support Afghan refugees in Pakistan, people returning to Afghanistan from neighbouring countries and Afghan people displaced by conflict.
Despite the hardships of fleeing with nothing, "they never lose their dreams for their children or their desire to better our world", Guterres said.
All in all, more than 737,000 people fled the conflict in South Sudan a year ago.
South Sudan has the fastest-growing displaced population in the world after peace efforts in the country fizzled out in July.More news: USA southwest swelters in one of its hottest summers
"By any measure this is an unacceptable number, and it speaks louder than ever to the need for solidarity and common objective in preventing and resolving crises, and ensuring together that the world's refugees, internally displaced and asylum seekers are properly protected and cared for while solutions are pursued", said UN High Commissioner for Refugees Filippo Grandi.
Ahead of World Refugee Day on Tuesday, the UN High Commissioner for Refugees (UNHCR) said in its annual Global Trends report that 65.6 million people were forcibly displaced worldwide by the end of 2016.
He said that through UNHCR's work - often on the front lines of conflict - "we witness the courage, tenacity and brilliance of refugees every single day". Azerbaijan suffered human losses and faced economic deprivation, however, despite this, it managed to cope with the problems and turn into a modern country, added the United Nations official.
And almost 70 years after Palestinians first fled today's Israel, some 5.3 million Palestinians are now living as refugees - the highest level ever recorded, UNHCR said.
The report defines refugees as those forced to leave their homes for other countries. The Spectator Index estimates that Turkey is home to about 2.7 million, Lebanon to 1.1 million and Jordan to about 657,000 Syrian refugees.More news: Mayweather, McGregor set Las Vegas fight date
The New York Times reports that Syria produced the most refugees past year, with 5.5 million, while almost 750,000 fled South Sudan. The country receiving the greatest number of requests for asylum for these children was Germany: 35,900.
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