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According to 2005 Singapore population statistics, out of a total population of 4,351,400, non-resident population was around 797,900. It is estimated that out of 10 persons working in Singapore, six were Singapore citizens, one was permanent resident and the remaining three were foreigners.
from: http://ezinearticles.com/?Why-Foreigners-Are-Taking-Up-Permanent-Residence-in-Singapore&id=6773245
