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 | 43.0 | 1:27:57.925 | 5.0 |
| Ayrton Senna | Lotus - Renault | 43.0 | + 19.827 | 4.0 |
| Stefan Johansson | Ferrari | 43.0 | + 23.592 | 11.0 |
| Michele Alboreto | Ferrari | 43.0 | + 29.634 | 9.0 |
| Jacques Laffite | Ligier - Renault | 43.0 | + 1:10.690 | 17.0 |
| Alain Prost | McLaren - TAG | 43.0 | + 2:17.772 | 3.0 |
| Teo Fabi | Benetton - BMW | 42.0 | + 1 Lap | 6.0 |
| Riccardo Patrese | Brabham - BMW | 42.0 | + 1 Lap | 15.0 |
| Marc Surer | Arrows - BMW | 41.0 | + 2 Laps | 21.0 |
| Gerhard Berger | Benetton - BMW | 41.0 | + 2 Laps | 2.0 |
| Alan Jones | Lola - Ford | 40.0 | Out of Fuel | 16.0 |
| Philippe Streiff | Tyrrell - Renault | 40.0 | + 3 Laps | 18.0 |
| Jonathan Palmer | Zakspeed | 37.0 | + 6 Laps | 20.0 |
| Andrea de Cesaris | Minardi - Motori Moderni | 35.0 | Out of Fuel | 19.0 |
| Huub Rothengatter | Zakspeed | 25.0 | Electrical | 23.0 |
| Martin Brundle | Tyrrell - Renault | 25.0 | Gearbox | 12.0 |
| Alessandro Nannini | Minardi - Motori Moderni | 24.0 | Gearbox | 22.0 |
| René Arnoux | Ligier - Renault | 23.0 | Engine | 7.0 |
| Nelson Piquet | Williams - Honda | 16.0 | Turbo | 1.0 |
| Thierry Boutsen | Arrows - BMW | 7.0 | Electrical | 14.0 |
| Johnny Dumfries | Lotus - Renault | 7.0 | Spun Off | 13.0 |
| Keke Rosberg | McLaren - TAG | 6.0 | Engine | 8.0 |
| Piercarlo Ghinzani | Osella - Alfa Romeo | 3.0 | Engine | 24.0 |
| Christian Danner | Osella - Alfa Romeo | 2.0 | Engine | 25.0 |
| Patrick Tambay | Lola - Ford | 0.0 | Accident | 10.0 |
Question:
How many laps for a grid of over 18 and retired due to electrical failure?
Answer:
25.0