user: Question: When did hans hartmann drive?
Columns: ['Year', 'Event', 'Venue', 'Driver', 'Result', 'Category', 'Report']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1938.0, 'Pau Grand Prix', 'Pau', 'Rudolf Caracciola Hermann Lang', '2', 'Grand Prix', 'Report']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Driver" = 'hans hartmann';