Question: What is the population density (per km) that has -6.7 as the change (%)?
SQL: SELECT "Population density (per km²)" FROM "2-189598-8" WHERE "Change (%)" = '-6.7';

Question: What population density (per km) that has 84 as the population (2006)?
SQL: SELECT "Population density (per km²)" FROM "2-189598-8" WHERE "Population (2006)" = '84';