user: Question: Which area 2006 km² has an area 1996 km² smaller than 17.31?
Columns: ['city', 'area 1996 km²', 'area 2006 km²', 'pop. 1999', 'pop. 2003', 'pop. 2006']
Types: ['text', 'real', 'real', 'text', 'text', 'real']
Sample row: ['Gdańsk', 265.03, 266.0, '457,937', '461,011', 456658.0]
SQL:

assistant: SELECT "area 2006 km²" FROM "Table" WHERE "area 1996 km²" < 17.31;