How many on the list are called the Austrian Grand Prix?
CREATE TABLE table_16638 (
    "Rd." real,
    "Grand Prix" text,
    "Pole Position" text,
    "Fastest Lap" text,
    "Winning Driver" text,
    "Constructor" text,
    "Report" text
)
SELECT COUNT("Rd.") FROM table_16638 WHERE "Grand Prix" = 'Austrian Grand Prix'
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 on the list are called the Austrian Grand Prix? ### Input: CREATE TABLE table_16638 (
    "Rd." real,
    "Grand Prix" text,
    "Pole Position" text,
    "Fastest Lap" text,
    "Winning Driver" text,
    "Constructor" text,
    "Report" text
) ### Response: SELECT COUNT("Rd.") FROM table_16638 WHERE "Grand Prix" = 'Austrian Grand Prix'