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_73 (year_set VARCHAR, event VARCHAR)
### Question:
What year had a 100m freestyle event?
### Answer:
SELECT COUNT(year_set) FROM table_name_73 WHERE event = "100m freestyle"