Fernando and Wolf,
I just visited the INTERPOL site,which has the national crime statistics for every country,and according to their data in Spain in 2001, 26.72% of the total crimes were committed by aliens(extranjeros). I am not sure where you got your stats Fernando, but I am interested in seeing that information, they may reflect another measure.

Interpol provides: Click here to be taken to the pdf file with the 2001 statistics

However you can visit www.Interpol.int to get other crime data! Excellent source of crime statistics.
From your friendly librarian,
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The world is a book, and those who do not travel read only a page.
--St. Augustine (354-430)