CREATE TABLE table_9515 ("Party" TEXT, "Leader" TEXT, "Seats" TEXT, "% of seats" TEXT, "First Pref votes" TEXT, "% FPv" TEXT)

What is the %FPv for the Workers' Party?
SELECT "% FPv" FROM table_9515 WHERE "Party" = 'workers'' party'
SELECT "% FPv" FROM "table_9515" WHERE "Party" = 'workers\' party'