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 | No | Driver | Team | Laps | Time/Retired | Grid | Points |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | 6 | Michael Andretti | Newman-Haas Racing | 150 | 1:33:39.268 | 8 | 20+1 |
| 2 | 99 | Greg Moore | Forsythe Racing | 150 | +0.075 | 1 | 16+1 |
| 3 | 1 | Alex Zanardi | Chip Ganassi Racing | 150 | +0.918 | 6 | 14 |
| 4 | 11 | Christian Fittipaldi | Newman-Haas Racing | 150 | +3.359 | 4 | 12 |
| 5 | 20 | Scott Pruett | Patrick Racing | 150 | +5.257 | 12 | 10 |
| 6 | 40 | Adrián Fernández | Patrick Racing | 150 | +5.926 | 5 | 8 |
| 7 | 5 | Gil de Ferran | Walker Racing | 150 | +6.810 | 11 | 6 |
| 8 | 8 | Bryan Herta | Team Rahal | 150 | +9.866 | 16 | 5 |
| 9 | 27 | Dario Franchitti | Team KOOL Green | 150 | +10.275 | 13 | 4 |
| 10 | 17 | Maurício Gugelmin | PacWest Racing Group | 150 | +10.855 | 10 | 3 |
| 11 | 33 | Patrick Carpentier | Forsythe Racing | 150 | +11.382 | 9 | 2 |
| 12 | 18 | Mark Blundell | PacWest Racing Group | 150 | +29.029 | 7 | 1 |
| 13 | 10 | Richie Hearn | Della Penna Motorsports | 149 | +1 Lap | 15 |  |
| 14 | 9 | JJ Lehto | Hogan Racing | 149 | +1 Lap | 29 |  |
| 15 | 15 | Roberto Moreno | Project Indy | 149 | +1 Lap | 23 |  |
| 16 | 12 | Jimmy Vasser | Chip Ganassi Racing | 148 | +2 Laps | 3 |  |
| 17 | 3 | André Ribeiro | Marlboro Team Penske | 148 | +2 Laps | 2 |  |
| 18 | 36 | Alex Barron | All American Racing | 148 | +2 Laps | 27 |  |
| 19 | 7 | Bobby Rahal | Team Rahal | 147 | +3 Laps | 17 |  |
| 20 | 98 | P. J. Jones | All American Racing | 146 | +4 Laps | 26 |  |
| 21 | 77 | Arnd Meier | Davis Racing | 136 | +14 Laps | 28 |  |
| 22 | 2 | Al Unser, Jr. | Marlboro Team Penske | 122 | Transmission | 14 |  |
| 23 | 24 | Hiro Matsushita | Arciero-Wells Racing | 121 | Contact | 24 |  |
| 24 | 16 | Hélio Castro-Neves | Bettenhausen Racing | 97 | Contact | 22 |  |
| 25 | 34 | Dennis Vitolo | Payton/Coyne Racing | 90 | Withdrew | 25 |  |
| 26 | 25 | Max Papis | Arciero-Wells Racing | 83 | Wheel Bearing | 20 |  |
| 27 | 26 | Paul Tracy | Team KOOL Green | 79 | Suspension | 21 |  |
| 28 | 19 | Michel Jourdain Jr. | Payton/Coyne Racing | 78 | Handling | 19 |  |
| 29 | 21 | Tony Kanaan | Tasman Motorsports Group | 32 | Contact | 18 |  |
Question:
how many american drivers participated in the race?
Answer:
9