CREATE TABLE table_68178 ("Name" TEXT, "Population  ( 2011 ) " FLOAT, "Population  ( 2006 ) " FLOAT, "Change  ( % ) " FLOAT, "Area  ( km\\u00b2 ) " FLOAT, "Population density" FLOAT)

What is the population density of Siglunes when the change was smaller than -8.1 percent?
SELECT COUNT("Population density") FROM table_68178 WHERE "Name" = 'siglunes' AND "Change (%)" < '-8.1'
SELECT COUNT("Population density") FROM "table_68178" WHERE "Change (%)" < '-8.1' AND "Name" = 'siglunes'