In the last three years, the numbers of Syrian nationals (main applicants only) refused asylum on third country grounds were as follows:
26 in 2012
99 in 2013
66 in 2014
The Home Office publishes annual and quarterly data on asylum applications and initial decisions; this is available in Table as_01 (Asylum data tables Volume 1) of the quarterly Immigration Statistics release.
A copy of the latest release, Immigration Statistics April – June 2015, is available from https://www.gov.uk/government/organisations/home-office/series/immigration-statistics-quarterly-release.