user: Question: Which transfer window ends after 2006?
Columns: ['Nat.', 'Name', 'Moving from', 'Type', 'Transfer window', 'Ends', 'Transfer fee']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['POR', 'Nuno Capucho', 'Porto', 'Transfer', 'Summer', 2005.0, '£0.67m']
SQL:

assistant: SELECT "Transfer window" FROM "Table" WHERE "Ends" > 2006.0;