Work permit inspectors received 104 complaints, and carried out 233 compliance visits, in the last 12 months.
The Department of Economic Development says they are vital in ensuring a fair and secure working environment on the Island.
The figures have been released following the prosecution of a director of Spice Catering Ltd last week - he pleaded guilty to employing people without work permits and fined £2,500.
Inspectors had responded to a tip off about malpractice which was alleged to have taken place at the Spice of India restaurant in Ramsey.
Last year fewer than 4,000 work permits were approved compared to 2003 when almost 13,000 were issued.
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