CREATE TABLE table_13795 ("Name" TEXT, "Population  ( 2011 ) " FLOAT, "Population  ( 2006 ) " TEXT, "Change  ( % ) " TEXT, "Land area  ( km\\u00b2 ) " TEXT, "Population density  ( per km\\u00b2 ) " TEXT)

What is the population density (per km) that has -6.7 as the change (%)?
SELECT "Population density (per km\u00b2)" FROM table_13795 WHERE "Change (%)" = '-6.7'
SELECT "Population density (per km\u00b2)" FROM "table_13795" WHERE "Change (%)" = '-6.7'