user: Question: What is the date made that has an associated fleet number of 4?
Columns: ['Type', 'Fleet numbers', 'Quantity made', 'Manufacturer', 'Date made', 'Date withdrawn']
Types: ['text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['0-6-2WT', '1', 1.0, 'Black, Hawthorn & Co', '1882', '1911']
SQL:

assistant: SELECT "Date made" FROM "Table" WHERE "Fleet numbers" = '4';