What round was the circuit portland international raceway?
CREATE TABLE table_43539 (
    "Round" real,
    "Race Name" text,
    "Circuit" text,
    "City/Location" text,
    "Date" text
)
SELECT "Round" FROM table_43539 WHERE "Circuit" = 'portland international raceway'
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 round was the circuit portland international raceway? ### Input: CREATE TABLE table_43539 (
    "Round" real,
    "Race Name" text,
    "Circuit" text,
    "City/Location" text,
    "Date" text
) ### Response: SELECT "Round" FROM table_43539 WHERE "Circuit" = 'portland international raceway'