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:
| Rider | Manufacturer | Laps | Time | Grid |
| --- | --- | --- | --- | --- |
| Álvaro Bautista | Aprilia | 20.0 | 42:56.428 | 2.0 |
| Hiroshi Aoyama | KTM | 20.0 | +2.586 | 1.0 |
| Marco Simoncelli | Gilera | 20.0 | +8.343 | 3.0 |
| Yuki Takahashi | Honda | 20.0 | +11.032 | 8.0 |
| Aleix Espargaro | Aprilia | 20.0 | +13.846 | 6.0 |
| Alex Debon | Aprilia | 20.0 | +14.274 | 9.0 |
| Roberto Locatelli | Gilera | 20.0 | +15.101 | 15.0 |
| Ratthapark Wilairot | Honda | 20.0 | +16.987 | 5.0 |
| Thomas Luthi | Aprilia | 20.0 | +25.356 | 14.0 |
| Lukas Pesek | Aprilia | 20.0 | +26.846 | 13.0 |
| Fabrizio Lai | Gilera | 20.0 | +49.907 | 12.0 |
| Karel Abraham | Aprilia | 20.0 | +50.088 | 18.0 |
| Alex Baldolini | Aprilia | 20.0 | +1:05.816 | 17.0 |
| Simone Grotzkyj | Gilera | 20.0 | +1:15.544 | 19.0 |
| Imre Toth | Aprilia | 20.0 | +1:19.905 | 16.0 |
| Manuel Hernandez | Aprilia | 20.0 | +1:35.890 | 21.0 |
| Daniel Arcas | Honda | 20.0 | +2:00.717 | 22.0 |
| Doni Tata Pradita | Yamaha | 20.0 | +2:28.842 | 20.0 |
| Mattia Pasini | Aprilia | 15.0 | Retirement | 11.0 |
| Julian Simon | KTM | 11.0 | Retirement | 7.0 |
| Mika Kallio | KTM | 5.0 | Retirement | 4.0 |
| Héctor Faubel | Aprilia | 4.0 | Accident | 10.0 |
Question:
What is the lowest grid number for Yamaha?
Answer:
20.0