CREATE TABLE table_17380 ("Season" TEXT, "Cup FinalDate" TEXT, "WinningTeam" TEXT, "Score" TEXT, "LosingTeam" TEXT, "Location" TEXT, "Cup Final Attendance" FLOAT)

How many losingteams were for the cup finaldate 20 August 1989?
SELECT COUNT("LosingTeam") FROM table_17380 WHERE "Cup FinalDate" = '20 August 1989'
SELECT COUNT("LosingTeam") FROM "table_17380" WHERE "Cup FinalDate" = '20 August 1989'