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 |
| --- | --- | --- | --- | --- |
| Mario Andretti | Lotus - Ford | 80.0 | 1:51:35.470 | 2.0 |
| Niki Lauda | Ferrari | 80.0 | + 0.773 s | 1.0 |
| Jody Scheckter | Wolf - Ford | 80.0 | + 4.857 s | 3.0 |
| Patrick Depailler | Tyrrell - Ford | 80.0 | + 1:14.487 | 12.0 |
| Emerson Fittipaldi | Fittipaldi - Ford | 80.0 | + 1:20.908 | 7.0 |
| Jean-Pierre Jarier | Penske - Ford | 79.0 | + 1 Lap | 9.0 |
| James Hunt | McLaren - Ford | 79.0 | + 1 Lap | 8.0 |
| Gunnar Nilsson | Lotus - Ford | 79.0 | + 1 Lap | 16.0 |
| Jacques Laffite | Ligier - Matra | 78.0 | Electrical | 5.0 |
| Brian Henton | March - Ford | 77.0 | + 3 Laps | 18.0 |
| Hans Binder | Surtees - Ford | 77.0 | + 3 Laps | 19.0 |
| Ronnie Peterson | Tyrrell - Ford | 62.0 | Fuel System | 10.0 |
| Clay Regazzoni | Ensign - Ford | 57.0 | Gearbox | 13.0 |
| Hans Joachim Stuck | Brabham - Alfa Romeo | 53.0 | Brakes | 17.0 |
| Alan Jones | Shadow - Ford | 40.0 | Gearbox | 14.0 |
| Jochen Mass | McLaren - Ford | 39.0 | Handling | 15.0 |
| John Watson | Brabham - Alfa Romeo | 33.0 | Illegal push start | 6.0 |
| Renzo Zorzi | Shadow - Ford | 27.0 | Gearbox | 20.0 |
| Alex Ribeiro | March - Ford | 15.0 | Gearbox | 22.0 |
| Carlos Reutemann | Ferrari | 5.0 | Accident | 4.0 |
| Brett Lunger | March - Ford | 4.0 | Accident | 21.0 |
| Vittorio Brambilla | Surtees - Ford | 0.0 | Accident | 11.0 |
Question:
How many laps did gunnar nilsson drive?
Answer:
79.0