Those values denote ship type; for example:
101=Tanker
102=Cargo
103=Passenger
When you talk about spawning frequency, I think you are a little confused. These numbers do not necessarily dictate frequency of appearing in the campaign, but (for example) a type 102 (cargo) would show up far more frequently than a type 103 (passenger). Of course, they will not show up at all unless there are generic entries in the random layer of the campaign file.
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