How many losingteams were for the cup finaldate 20 August 1989?
CREATE TABLE table_17380 (
    "Season" text,
    "Cup FinalDate" text,
    "WinningTeam" text,
    "Score" text,
    "LosingTeam" text,
    "Location" text,
    "Cup Final Attendance" real
)
SELECT COUNT("LosingTeam") FROM table_17380 WHERE "Cup FinalDate" = '20 August 1989'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many losingteams were for the cup finaldate 20 August 1989? ### Input: CREATE TABLE table_17380 (
    "Season" text,
    "Cup FinalDate" text,
    "WinningTeam" text,
    "Score" text,
    "LosingTeam" text,
    "Location" text,
    "Cup Final Attendance" real
) ### Response: SELECT COUNT("LosingTeam") FROM table_17380 WHERE "Cup FinalDate" = '20 August 1989'