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