Syria refugee crisis

UN data

 * Registered Syrian Refugees 4,290,332 (as of 3.11.2015), mostly in neighboring countries. Half of those are males, and 22% of those are in the 18 to 59 year  old range.
 * Asylum applications in Europe: 512,909	as of September 2015 (recent media reports put the number as 750 thousands)

Internally displaced
7.6 million according to internal-displacement.org as of July 2015

Total population
About 23 million by wikipedia and estimated to be about the same elsewhere 1 2.

This makes roughly about half of population in either refugee or internally displaced status...

(PS. Before the war, there were many refugees from Iraq in Syria)