What is the pa listed when the ends won is 21?
CREATE TABLE table_31214 (
    "Skip (Club)" text,
    "W" real,
    "L" real,
    "PF" real,
    "PA" real,
    "Ends Won" real,
    "Ends Lost" real,
    "Blank Ends" real,
    "Stolen Ends" real
)
SELECT MAX("PA") FROM table_31214 WHERE "Ends Won" = '21'
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: What is the pa listed when the ends won is 21? ### Input: CREATE TABLE table_31214 (
    "Skip (Club)" text,
    "W" real,
    "L" real,
    "PF" real,
    "PA" real,
    "Ends Won" real,
    "Ends Lost" real,
    "Blank Ends" real,
    "Stolen Ends" real
) ### Response: SELECT MAX("PA") FROM table_31214 WHERE "Ends Won" = '21'