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 |
| --- | --- | --- | --- | --- |
| Nelson Piquet | Williams - Honda | 76.0 | 2:00:34.508 | 2.0 |
| Ayrton Senna | Lotus - Renault | 76.0 | + 17.673 | 1.0 |
| Nigel Mansell | Williams - Honda | 75.0 | + 1 Lap | 4.0 |
| Stefan Johansson | Ferrari | 75.0 | + 1 Lap | 7.0 |
| Johnny Dumfries | Lotus - Renault | 74.0 | + 2 Laps | 8.0 |
| Martin Brundle | Tyrrell - Renault | 74.0 | + 2 Laps | 16.0 |
| Patrick Tambay | Lola - Ford | 74.0 | + 2 Laps | 6.0 |
| Philippe Streiff | Tyrrell - Renault | 74.0 | + 2 Laps | 18.0 |
| Philippe Alliot | Ligier - Renault | 73.0 | + 3 Laps | 12.0 |
| Jonathan Palmer | Zakspeed | 70.0 | + 6 Laps | 24.0 |
| René Arnoux | Ligier - Renault | 48.0 | Engine | 9.0 |
| Alan Jones | Lola - Ford | 46.0 | Differential | 10.0 |
| Gerhard Berger | Benetton - BMW | 44.0 | Transmission | 11.0 |
| Thierry Boutsen | Arrows - BMW | 40.0 | Electrical | 22.0 |
| Keke Rosberg | McLaren - TAG | 34.0 | Suspension | 5.0 |
| Teo Fabi | Benetton - BMW | 32.0 | Transmission | 13.0 |
| Alessandro Nannini | Minardi - Motori Moderni | 30.0 | Engine | 17.0 |
| Michele Alboreto | Ferrari | 29.0 | Accident | 15.0 |
| Derek Warwick | Brabham - BMW | 28.0 | Accident | 19.0 |
| Alain Prost | McLaren - TAG | 23.0 | Accident | 3.0 |
| Piercarlo Ghinzani | Osella - Alfa Romeo | 15.0 | Suspension | 23.0 |
| Christian Danner | Arrows - BMW | 7.0 | Suspension | 21.0 |
| Riccardo Patrese | Brabham - BMW | 5.0 | Gearbox | 14.0 |
| Andrea de Cesaris | Minardi - Motori Moderni | 5.0 | Engine | 20.0 |
| Huub Rothengatter | Zakspeed | 2.0 | Radiator | 25.0 |
| Allen Berg | Osella - Alfa Romeo | 1.0 | Turbo | 26.0 |
Question:
How many laps for grid 12?
Answer:
73.0