Eurydice 2012 reports the following percentage of high school students in Italy studying these languages:
(we should also add Latin for about 10 % and Ancient Greek for about 3 %; disaggregated numbers are only reported for top5 EU languages).
More directly useful for CLDR purposes, the national statistics bureau ISTAT <http://www3.istat.it/salastampa/comunicati/non_calendario/20070420_00/> gives the following as percentages of 6+ years old inhabitants with a self-reported good or excellent level in the respective foreign languages (table 18):
en 12.8 % (0.293 * 0.436)
fr 6.3 % (0.218 * 0.219)
de 1.6 % (0.276 * 0.059)
other 2.1 % (0.536 * 0.040)
Given Eurydice data and the relevance provided in table 22, where it's mentioned before German, it would also fair to deduce that Spanish is at some 1.5 % as well.
Additional data from other tickets:
en – none, enough to add nonetheless?
fr – recognised minority language,
de – same
es – 190 228 immigrants native speakers