How many winner's shares have ai miyazato as the champion?
CREATE TABLE table_7040 (
    "Year" real,
    "Dates" text,
    "Champion" text,
    "Country" text,
    "Score" text,
    "Margin of victory" text,
    "Tournament Location" text,
    "Purse ( US$ )" real,
    "Winner's share" real
)
SELECT SUM("Winner's share") FROM table_7040 WHERE "Champion" = 'ai miyazato'
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 winner's shares have ai miyazato as the champion? ### Input: CREATE TABLE table_7040 (
    "Year" real,
    "Dates" text,
    "Champion" text,
    "Country" text,
    "Score" text,
    "Margin of victory" text,
    "Tournament Location" text,
    "Purse ( US$ )" real,
    "Winner's share" real
) ### Response: SELECT SUM("Winner's share") FROM table_7040 WHERE "Champion" = 'ai miyazato'