I don't think sounds right. Syrians, Afghans, and Eritreans are being lumped together and it's misleading. 

 Currently it says: "as of October 2015, 75% of the over half a million Mediterranean Sea arrivals since the beginning of the year are refugees coming from Syria (55%), Afghanistan (14%) and Eritrea (6%)." 

 I think it should be changed to something like: "as of October 2015, over half a million Mediterranean Sea arrivals since the beginning of the year are migrants coming from Syria (55%), Afghanistan (14%) and Eritrea (6%)." 
 (removing the "75% of the" bit, and shouldn't it also say migrants? Considering not all of them are refugees)