Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_8 (population_density__per_km²_ VARCHAR, change___percentage_ VARCHAR)
### Question:
What is the population density (per km) that has -6.7 as the change (%)?
### Answer:
SELECT population_density__per_km²_ FROM table_name_8 WHERE change___percentage_ = "-6.7"