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 table_10007452_3 (order_year VARCHAR, fleet_series__quantity_ VARCHAR)
### Question:
how many times is the fleet series (quantity) is 468-473 (6)?
### Answer:
SELECT COUNT(order_year) FROM table_10007452_3 WHERE fleet_series__quantity_ = "468-473 (6)"