user: Question: What is the population density of siglunes when the change was smaller than -8.1 percent?
Columns: ['Name', 'Population (2011)', 'Population (2006)', 'Change (%)', 'Area (km²)', 'Population density']
Types: ['text', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Albert', 323.0, 339.0, 4.7, 769.55, 0.4]
SQL:

assistant: SELECT "Population density" FROM "Table" WHERE "Name" = 'siglunes' AND "Change (%)" < -8.1;