user: Question: When  9/07/1999 is the date of withdrawn what is the original number?
Columns: ['Original number', 'UIC number', 'Name', 'Constructer', 'constructor number', 'Year', 'Withdrawn', 'Kilometers worked']
Types: ['text', 'text', 'text', 'text', 'real', 'real', 'text', 'real']
Sample row: ['2001 T', '352-001-2', '"Virgen del Rosario"', 'Krauss-Maffei', 19094.0, 1964.0, '22/04/2002', 7443836.0]
SQL:

assistant: SELECT "Original number" FROM "Table" WHERE "Withdrawn" = '9/07/1999';