A record 33.3 million people worldwide were displaced by conflict and violence inside their own nations in 2013, U.N. and Norwegian officials said Wednesday.

The increase of 4.5 million above the 2012 total was driven largely by Syria’s civil war, now in its fourth year, which activists estimate has killed 150,000 people.

The heads of the U.N. refugee agency and Norwegian Refugee Council reported that 8.2 million fled their homes in the last year, including about 3.5 million in Syria alone. The other two-thirds of the 33.3 million displaced by war worldwide had fled in previous years.

Every 60 seconds another family within Syria flees the civil war, according to the figures.