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

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%'