It seems that you've referred to specific columns and data that I can't see. However, I can provide you with a general format for creating expressions based on a town's population using variables like XY or Z.
Assuming you have a town with a population that can be represented by the variables XY and Z, here are two example expressions:
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If the population is estimated to be proportional to XY: \[ \text{Population}_{\text{town}} = k \cdot XY \] where \( k \) is a constant scaling factor representing the relation between the variable and the population.
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If the population can also be estimated using the variable Z: \[ \text{Population}_{\text{town}} = m \cdot Z \] where \( m \) is another constant scaling factor.
If you can provide more specific details about the numbers or the town you are referring to, I can give you tailored expressions!