user: ### NOW ANSWER:
Question: What is the total number of teams founded that were left in 1976?
Columns: ['Institution', 'Location', 'Founded', 'Type', 'Enrollment', 'Nickname', 'Joined', 'Left', 'Current Conference']
Types: ['text', 'text', 'real', 'text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Anderson University', 'Anderson, South Carolina', 1911.0, 'Private', 2907.0, 'Trojans', '1998', '2010', 'SAC']
SQL:

assistant: SELECT SUM("Founded") FROM "Table" WHERE "Left" = '1976';