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:
| Position | Race Number | Driver | Country | Laps |
| --- | --- | --- | --- | --- |
| 1. | 11.0 | Derek Warwick | GB | 16 |
| 2. | 9.0 | David Brabham | AUS | 16 |
| 3. | 2.0 | Davy Jones | USA | 16 |
| 4. | 15.0 | Juan Manuel Fangio II | RA | 16 |
| 5. | 10.0 | Armin Hahne | D | 16 |
| 6. | 4.0 | Bob Wollek | F | 16 |
| 7. | 5.0 | Tiff Needell | GB | 16 |
| 8. | 6.0 | Jim Richards | NZ | 16 |
| 9. | 8.0 | Matsuaki Sanada | J | 16 |
| 10. | 7.0 | Cor Euser | NL | 16 |
| 11. | 12.0 | David Leslie | GB | 16 |
| 12. | 3.0 | Andy Evans | USA | 16 |
| 13. | 14.0 | Yojiro Terada | J | 16 |
| 14. | 16.0 | Ian Flux | GB | 15 |
| 15. | 1.0 | Matt Aitken | GB | 13 |
| DNF | 13.0 | John Nielsen | DK | DNF |
Question:
what is the race number of bob wollek
Answer:
4.0