CREATE TABLE table_19475 ("Date Released" TEXT, "Polling institute" TEXT, "Socialist" TEXT, "Social Democratic" TEXT, "Peoples Party" TEXT, "Green-Communist" TEXT, "Left Bloc" TEXT, "Lead" TEXT)

When was there 8.9% Green-Communist?
SELECT "Date Released" FROM table_19475 WHERE "Green-Communist" = '8.9%'
SELECT "Date Released" FROM "table_19475" WHERE "Green-Communist" = '8.9%'