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

### Instruction:
What is the lowest density of a town with a 13,708 2011 population census ?

### Inputs:
table_name: table, columns: ['Local Government Area', 'Principal town', 'Land Area (km²)', 'Population 2011 census', 'Density']

### Response:
SELECT MIN Density FROM table WHERE Population 2011 census = 13,708