The map below shows the flow of asylum seekers to European countries over time.
Each moving point on the map represents 25 people. That corresponds to approximately one busload with every other seat taken.
The United Nations estimates that half a million Syrian refugees have sought asylum in Europe between April 2011 and September 2015. Standing very tighly together, they would fit on 8 soccer fields.
Only a small fraction of refugees fleeing their homes make it to Europe. The UN has registered four million Syrian refugees in Turkey, Lebanon, Jordan, Iraq, Egypt and North Africa. Most of them live in refugee camps close to the border. They would fit on 59 soccer fields.