Class of 500cc, and a Wins smaller than 0 had what average year?
CREATE TABLE table_name_75 (year INTEGER, class VARCHAR, wins VARCHAR)
SELECT AVG(year) FROM table_name_75 WHERE class = "500cc" AND wins < 0
### Context: CREATE TABLE table_name_75 (year INTEGER, class VARCHAR, wins VARCHAR) ### Question: Class of 500cc, and a Wins smaller than 0 had what average year? ### Answer: SELECT AVG(year) FROM table_name_75 WHERE class = "500cc" AND wins < 0