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_name_39 (year VARCHAR, date__opening_ VARCHAR)
### Question:
What is the total number of Year(s), when Date (Opening) is "September 21"?
### Answer:
SELECT COUNT(year) FROM table_name_39 WHERE date__opening_ = "september 21"