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:
| Pos. | Car # | Driver | Make | Team |
| --- | --- | --- | --- | --- |
| 1 | 38 | Jason Leffler | Toyota | Braun Racing |
| 2 | 16 | Greg Biffle | Ford | Roush Fenway Racing |
| 3 | 99 | David Reutimann | Toyota | Michael Waltrip Racing |
| 4 | 60 | Carl Edwards | Ford | Roush Fenway Racing |
| 5 | 77 | Ron Hornaday | Chevrolet | Kevin Harvick Incorporated |
| 6 | 20 | Aric Almirola | Chevrolet | Joe Gibbs Racing |
| 7 | 29 | Scott Wimmer | Chevrolet | Richard Childress Racing |
| 8 | 42 | Kevin Hamlin | Dodge | Chip Ganassi Racing |
| 9 | 10 | Mike Bliss | Toyota | Braun Racing |
| 10 | 88 | Brad Keselowski | Chevrolet | JR Motorsports |
Question:
how many chevrolets were in the top 10?
Answer:
4