In 2015, there were almost 96,000 asylum applications by unaccompanied minors to the European Union (EU), about four times those in the previous year, the European Asylum Support Office (EASO) states in its annual report. These represent about 7% of the total number of applications received by EASO. Of these, just over half were by Afghans, followed by Syrians and Eritreans.  

While 70% of the total number of applications by unaccompanied minors was lodged in just four countries, Germany, Sweden, Hungary and Austria, a press release by the European Statistical Office, EUROSTAT, stated that the largest share of applications for asylum anywhere were recorded in Italy.   

Although data on the success rate of asylum applications by unaccompanied minors are unavailable, the Pew Research Centre reports that the highest success rates for all asylum-seekers to Europe are among the Syrians, Eritreans and Iraqis.

In the worst refugee crisis in Europe since WWII, 1.4 million refugees have sought asylum in Europe.  Of these, most were from Syria and Afghanistan.  The United Nations Children's Emergency Fund (UNICEF), in a report published in mid-June 2016, noted that nine out of 10 minors arriving in Europe through Italy in 2016 had been unaccompanied.

To know more, read:

http://ec.europa.eu/eurostat/documents/2995521/7244677/3-02052016-AP-EN.pdf/
http://www.reuters.com/article/us-europe-migrants-asylum-idUSKCN0ZO18R
https://www.rt.com/news/350267-unaccompanied-minors-asylum-eu/
http://www.pewresearch.org/fact-tank/2016/05/10/eu-unaccompanied-minors/
https://www.euractiv.com/section/global-europe/news/nearly-90000-unaccompanied-minors-sought-asylum-in-eu-in-2015/
https://www.thebureauinvestigates.com/2016/04/10/revealed-fourfold-rise-95000-unaccompanied-children-claim-asylum-europe-2015/