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 |
| --- | --- | --- | --- | --- |
| Nigel Mansell | Williams - Honda | 70.0 | 1:37:21.900 | 2.0 |
| Alain Prost | McLaren - TAG | 70.0 | + 18.772 | 3.0 |
| Nelson Piquet | Williams - Honda | 70.0 | + 49.274 | 6.0 |
| Ayrton Senna | Lotus - Renault | 69.0 | Out of Fuel | 1.0 |
| Michele Alboreto | Ferrari | 69.0 | + 1 Lap | 13.0 |
| Stefan Johansson | Ferrari | 69.0 | + 1 Lap | 8.0 |
| René Arnoux | Ligier - Renault | 69.0 | + 1 Lap | 10.0 |
| Teo Fabi | Benetton - BMW | 68.0 | + 2 Laps | 5.0 |
| Johnny Dumfries | Lotus - Renault | 68.0 | + 2 Laps | 15.0 |
| Thierry Boutsen | Arrows - BMW | 67.0 | + 3 Laps | 21.0 |
| Christian Danner | Arrows - BMW | 67.0 | + 3 Laps | 22.0 |
| Jonathan Palmer | Zakspeed | 67.0 | + 3 Laps | 20.0 |
| Allen Berg | Osella - Alfa Romeo | 63.0 | + 7 Laps | 27.0 |
| Riccardo Patrese | Brabham - BMW | 62.0 | Engine | 9.0 |
| Patrick Tambay | Lola - Ford | 62.0 | Not Classified | 14.0 |
| Alessandro Nannini | Minardi - Motori Moderni | 60.0 | Not Classified | 18.0 |
| Gerhard Berger | Benetton - BMW | 44.0 | Spun Off | 4.0 |
| Andrea de Cesaris | Minardi - Motori Moderni | 43.0 | Spun Off | 16.0 |
| Keke Rosberg | McLaren - TAG | 41.0 | Electrical | 7.0 |
| Derek Warwick | Brabham - BMW | 41.0 | Electrical | 12.0 |
| Philippe Alliot | Ligier - Renault | 39.0 | Engine | 11.0 |
| Philippe Streiff | Tyrrell - Renault | 28.0 | Engine | 23.0 |
| Martin Brundle | Tyrrell - Renault | 18.0 | Engine | 19.0 |
| Alan Jones | Lola - Ford | 10.0 | Brakes/Spin | 17.0 |
| Huub Rothengatter | Zakspeed | 9.0 | Transmission | 26.0 |
| Piercarlo Ghinzani | Osella - Alfa Romeo | 8.0 | Engine | 24.0 |
| Ivan Capelli | AGS - Motori Moderni | 6.0 | Transmission | 25.0 |
Question:
Which Grid has a Driver of johnny dumfries?
Answer:
15.0