Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Event | Venue | Driver | Result | Category | Report |
| --- | --- | --- | --- | --- | --- | --- |
| 1938.0 | Pau Grand Prix | Pau | Rudolf Caracciola Hermann Lang | 2 | Grand Prix | Report |
| 1938.0 | Tripoli Grand Prix | Mellaha | Hermann Lang | 1 | Grand Prix † | Report |
| 1938.0 | Tripoli Grand Prix | Mellaha | Manfred von Brauchitsch | 2 | Grand Prix † | Report |
| 1938.0 | Tripoli Grand Prix | Mellaha | Rudolf Caracciola | 3 | Grand Prix † | Report |
| 1938.0 | Coppa Ciano | Livorno | Hermann Lang | 1 | Grand Prix | Report |
| 1938.0 | Coppa Ciano | Livorno | Rudolf Caracciola | Ret | Grand Prix | Report |
| 1938.0 | Coppa Ciano | Livorno | Manfred von Brauchitsch | DSQ | Grand Prix | Report |
| 1938.0 | Coppa Acerbo | Pescara | Rudolf Caracciola | 1 | Grand Prix | Report |
| 1938.0 | Coppa Acerbo | Pescara | Hermann Lang | Ret | Grand Prix | Report |
| 1938.0 | Coppa Acerbo | Pescara | Manfred von Brauchitsch | Ret | Grand Prix | Report |
| 1938.0 | Donington Grand Prix | Donington Park | Hermann Lang | 2 | Grand Prix | Report |
| 1938.0 | Donington Grand Prix | Donington Park | Richard Seaman | 3 | Grand Prix | Report |
| 1938.0 | Donington Grand Prix | Donington Park | Manfred von Brauchitsch | 5 | Grand Prix | Report |
| 1938.0 | Donington Grand Prix | Donington Park | Walter Bäumer | Ret | Grand Prix | Report |
| 1939.0 | Pau Grand Prix | Pau | Hermann Lang | 1 | Grand Prix | Report |
| 1939.0 | Pau Grand Prix | Pau | Manfred von Brauchitsch | 2 | Grand Prix | Report |
| 1939.0 | Pau Grand Prix | Pau | Rudolf Caracciola | Ret | Grand Prix | Report |
| 1939.0 | Eifelrennen | Nürburgring | Hermann Lang | 1 | Grand Prix | Report |
| 1939.0 | Eifelrennen | Nürburgring | Rudolf Caracciola | 3 | Grand Prix | Report |
| 1939.0 | Eifelrennen | Nürburgring | Manfred von Brauchitsch | 4 | Grand Prix | Report |
| 1939.0 | Eifelrennen | Nürburgring | Hans Hartmann | 8 | Grand Prix | Report |
| 1939.0 | Eifelrennen | Nürburgring | Richard Seaman | Ret | Grand Prix | Report |
| 1939.0 | Belgrade City Race | Kalemegdan Park | Manfred von Brauchitsch | 2 | Grand Prix | Report |
| 1939.0 | Belgrade City Race | Kalemegdan Park | Hermann Lang | Ret | Grand Prix | Report |
| 1947.0 | Indianapolis 500 | Indianapolis | Duke Nalon | Ret | American National Championship | Report |
| 1948.0 | Indianapolis 500 | Indianapolis | Chet Miller * Ken Fowler Louis Tomei | Ret | American National Championship | Report |
| 1949.0 | Indianapolis 500 | Indianapolis | Joel Thorne | DNQ | American National Championship | Report |
| 1951.0 | Juan Peron Grand Prix | Costanera | Hermann Lang | 2 | Formula Libre | Report |
| 1951.0 | Juan Peron Grand Prix | Costanera | Juan Manuel Fangio | 3 | Formula Libre | Report |
| 1951.0 | Juan Peron Grand Prix | Costanera | Karl Kling | 6 | Formula Libre | Report |
| 1951.0 | Eva Peron Grand Prix | Costanera | Karl Kling | 2 | Formula Libre | Report |
| 1951.0 | Eva Peron Grand Prix | Costanera | Hermann Lang | 3 | Formula Libre | Report |
| 1951.0 | Eva Peron Grand Prix | Costanera | Juan Manuel Fangio | Ret | Formula Libre | Report |
| 1957.0 | Indianapolis 500 | Indianapolis | Danny Kladis | DNQ | American National Championship | Report |
Question:
When did Hans Hartmann drive?
Answer:
1.0