Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
When the # is 4, what is the pop./ km²?

### Inputs:
table_name: table, columns: ['#', 'Name', 'Name (English)', 'Population 2008-07-01', 'Area (km²)', 'Pop./ km²', 'ISO 3166-2', 'Administrative centre']

### Response:
SELECT Pop./ km² FROM table WHERE # = 4