Table schema:
CREATE TABLE table_name_47 (population__on_the_census_also_called_censo_2010_ VARCHAR, deputies_required_ignoring_the_limits INTEGER)

Question: According to the 2010 census, what was the population for the federal state that had less than -6 deputies required ignoring the limits?
SQL: SELECT population__on_the_census_also_called_censo_2010_ FROM table_name_47 WHERE deputies_required_ignoring_the_limits < -6