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 |
| --- | --- | --- | --- | --- |
| Felipe Massa | Ferrari | 71.0 | 1:34:11.435 | 1.0 |
| Fernando Alonso | Renault | 71.0 | +13.298 | 6.0 |
| Kimi Räikkönen | Ferrari | 71.0 | +16.235 | 3.0 |
| Sebastian Vettel | Toro Rosso - Ferrari | 71.0 | +38.011 | 7.0 |
| Lewis Hamilton | McLaren - Mercedes | 71.0 | +38.907 | 4.0 |
| Timo Glock | Toyota | 71.0 | +44.368 | 10.0 |
| Heikki Kovalainen | McLaren - Mercedes | 71.0 | +55.074 | 5.0 |
| Jarno Trulli | Toyota | 71.0 | +1:08.433 | 2.0 |
| Mark Webber | Red Bull - Renault | 71.0 | +1:19.666 | 12.0 |
| Nick Heidfeld | BMW Sauber | 70.0 | +1 lap | 8.0 |
| Robert Kubica | BMW Sauber | 70.0 | +1 lap | 13.0 |
| Nico Rosberg | Williams - Toyota | 70.0 | +1 lap | 18.0 |
| Jenson Button | Honda | 70.0 | +1 lap | 17.0 |
| Sébastien Bourdais | Toro Rosso - Ferrari | 70.0 | +1 lap | 9.0 |
| Rubens Barrichello | Honda | 70.0 | +1 lap | 15.0 |
| Adrian Sutil | Force India - Ferrari | 69.0 | +2 laps | 20.0 |
| Kazuki Nakajima | Williams - Toyota | 69.0 | +2 laps | 16.0 |
| Giancarlo Fisichella | Force India - Ferrari | 69.0 | +2 laps | 19.0 |
| Nelson Piquet Jr. | Renault | 0.0 | Accident | 11.0 |
| David Coulthard | Red Bull - Renault | 0.0 | Collision | 14.0 |
Question:
How many Laps have a Grid of 15?
Answer:
1.0