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_21564794_3 (left_st_louis INTEGER, venue VARCHAR)
### Question:
What year did the team who played at the Scottrade Center leave the city?
### Answer:
SELECT MIN(left_st_louis) FROM table_21564794_3 WHERE venue = "Scottrade Center"