user: Question: What's the 1991 census of the city of Carpi?
Columns: ['#', 'City', '1981 Census', '1991 Census', '2001 Census', '2010 Est.', 'Region']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'text']
Sample row: [1.0, 'Rome', 2840259.0, 2775250.0, 2546804.0, 2761477.0, 'Lazio']
SQL:

assistant: SELECT "1991 Census" FROM "Table" WHERE "City" = 'Carpi';