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:
| Driver | Constructor | Laps | Time/Retired | Grid |
| --- | --- | --- | --- | --- |
| Michele Alboreto | Ferrari | 67.0 | 1:35:31.337 | 8.0 |
| Alain Prost | McLaren - TAG | 67.0 | + 11.661 | 3.0 |
| Jacques Laffite | Ligier - Renault | 67.0 | + 51.154 | 13.0 |
| Thierry Boutsen | Arrows - BMW | 67.0 | + 55.279 | 15.0 |
| Niki Lauda | McLaren - TAG | 67.0 | + 1:13.972 | 12.0 |
| Nigel Mansell | Williams - Honda | 67.0 | + 1:16.820 | 10.0 |
| Gerhard Berger | Arrows - BMW | 66.0 | + 1 Lap | 17.0 |
| Stefan Bellof | Tyrrell - Renault | 66.0 | + 1 lap | 19.0 |
| Stefan Johansson | Ferrari | 66.0 | + 1 Lap | 2.0 |
| Martin Brundle | Tyrrell - Ford | 63.0 | + 4 Laps | 26.0 |
| Pierluigi Martini | Minardi - Motori Moderni | 62.0 | Engine | 27.0 |
| Keke Rosberg | Williams - Honda | 61.0 | Brakes | 4.0 |
| Eddie Cheever | Alfa Romeo | 45.0 | Turbo | 18.0 |
| Elio de Angelis | Lotus - Renault | 40.0 | Engine | 7.0 |
| Huub Rothengatter | Osella - Alfa Romeo | 32.0 | Gearbox | 25.0 |
| Teo Fabi | Toleman - Hart | 29.0 | Clutch | 1.0 |
| Ayrton Senna | Lotus - Renault | 27.0 | CV joint | 5.0 |
| Derek Warwick | Renault | 25.0 | Ignition | 20.0 |
| Nelson Piquet | Brabham - BMW | 23.0 | Turbo | 6.0 |
| Patrick Tambay | Renault | 19.0 | Spun Off | 16.0 |
| Marc Surer | Brabham - BMW | 15.0 | Engine | 11.0 |
| Manfred Winkelhock | RAM - Hart | 8.0 | Engine | 22.0 |
| Riccardo Patrese | Alfa Romeo | 8.0 | Gearbox | 9.0 |
| François Hesnault | Renault | 8.0 | Clutch | 23.0 |
| Philippe Alliot | RAM - Hart | 8.0 | Oil Pressure | 21.0 |
| Jonathan Palmer | Zakspeed | 7.0 | Alternator | 24.0 |
| Andrea de Cesaris | Ligier - Renault | 0.0 | Collision | 14.0 |
Question:
What's the average of the amount of laps for the driver patrick tambay?
Answer:
19.0