Table: portuguese_85_election
Columns: date_released
institute
socialist
social_democratic
united_people_alliance
democratic_and_social_centre
democratic_renewal
lead

Question: which institutes gave the democratic renewal 18.0% – 22.0% on a poll from October 6, 1985?
SQL: SELECT "institute" FROM portuguese_85_election WHERE "democratic_renewal" = '18.0% – 22.0%'