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_25 (year_left INTEGER, mascot VARCHAR)
### Question:
What is the year that the Roughriders left the conference?
### Answer:
SELECT MAX(year_left) FROM table_name_25 WHERE mascot = "roughriders"