user: Question: In what year did the school with enrollment of 650 leave?
Columns: ['Institution', 'Location', 'Nickname', 'Founded', 'Type', 'Enrollment', 'Joined', 'Left', 'Current Conference']
Types: ['text', 'text', 'text', 'real', 'text', 'real', 'real', 'real', 'text']
Sample row: ['Daniel Webster College', 'Nashua, New Hampshire', 'Eagles', 1965.0, 'Private', 1200.0, 1995.0, 2008.0, 'NECC']
SQL:

assistant: SELECT "Left" FROM "Table" WHERE "Enrollment" = 650.0;