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

### Instruction:
What is the population density of Siglunes when the change was smaller than -8.1 percent?

### Inputs:
table_name: table, columns: ['Name', 'Population (2011)', 'Population (2006)', 'Change (%)', 'Area (km²)', 'Population density']

### Response:
SELECT COUNT Population density FROM table WHERE Name = siglunes AND Change (%) < -8.1