user
Instruction
Answer the question based on the provided table.


Table
Table Title: 2007 Bavaria Champ Car Grand Prix
Table Content:
| Pos | Name | Team | Laps | Time/Retired | Grid | Points |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | Justin Wilson | RuSPORT | 69 | 1:46:02.236 | 2 | 32 |
| 2 | Jan Heylen | Conquest Racing | 69 | +7.227 | 7 | 27 |
| 3 | Bruno Junqueira | Dale Coyne Racing | 69 | +8.419 | 11 | 26 |
| 4 | Tristan Gommendy | PKV Racing | 69 | +9.037 | 3 | 23 |
| 5 | Neel Jani | PKV Racing | 69 | +22.262 | 4 | 21 |
| 6 | Simon Pagenaud | Team Australia | 69 | +22.698 | 5 | 19 |
| 7 | Sébastien Bourdais | N/H/L Racing | 69 | +22.955 | 1 | 18 |
| 8 | Oriol Servià | Forsythe Racing | 69 | +23.406 | 13 | 15 |
| 9 | Graham Rahal | N/H/L Racing | 69 | +23.949 | 6 | 13 |
| 10 | Ryan Dalziel | Pacific Coast Motorsports | 69 | +29.554 | 15 | 11 |
| 11 | Dan Clarke | Minardi Team USA | 69 | +38.903 | 10 | 11 |
| 12 | Katherine Legge | Dale Coyne Racing | 69 | +44.860 | 14 | 9 |
| 13 | Robert Doornbos | Minardi Team USA | 69 | +1:00.638 | 9 | 8 |
| 14 | Will Power | Team Australia | 69 | +1:01.204 | 8 | 7 |
| 15 | Alex Tagliani | Rocketsports | 68 | + 1 Lap | 12 | 6 |
| 16 | Alex Figge | Pacific Coast Motorsports | 68 | + 1 Lap | 16 | 5 |
| 17 | Paul Tracy | Forsythe Racing | 14 | Mechanical | 17 | 4 |


Question
what is the combined point score of the american drivers?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["18"]