Taking the January and Februry numbers for holders of Spanish sovereign debt, both unstripped (€433 billion held by non-residents) [1] and stripped (€22,4 billion) [2], foreigners own 73% of the central government's outstanding debt.

[1] http://www.tesoro.es/doc/EN/home/estadistica/06i.pdf

[2] http://www.tesoro.es/doc/EN/home/estadistica/07a09I.pdf