Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE races (raceid VARCHAR, name VARCHAR); CREATE TABLE results (raceid VARCHAR)
### Question:
How many drivers participated in the race Australian Grand Prix held in 2009?
### Answer:
SELECT COUNT(*) FROM results AS T1 JOIN races AS T2 ON T1.raceid = T2.raceid WHERE T2.name = "Australian Grand Prix" AND YEAR = 2009