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_53 (date VARCHAR, silbert VARCHAR)
### Question:
What is the date of the poll with Silbert at 18%?
### Answer:
SELECT date FROM table_name_53 WHERE silbert = "18%"