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:
| Driver | Constructor | Laps | Time/Retired | Grid |
| --- | --- | --- | --- | --- |
| Jackie Stewart | Matra - Ford | 80.0 | 1:50:39.1 | 4.0 |
| Graham Hill | Lotus - Ford | 80.0 | + 18.8 | 7.0 |
| Denny Hulme | McLaren - Ford | 80.0 | + 31.8 | 3.0 |
| Jo Siffert | Lotus - Ford | 80.0 | + 49.2 | 12.0 |
| Bruce McLaren | McLaren - Ford | 79.0 | + 1 Lap | 8.0 |
| Jean-Pierre Beltoise | Matra - Ford | 78.0 | + 2 Laps | 11.0 |
| Jackie Oliver | BRM | 77.0 | + 3 Laps | 14.0 |
| Sam Tingle | Brabham - Repco | 73.0 | + 7 Laps | 17.0 |
| Peter de Klerk | Brabham - Repco | 67.0 | Not Classified | 16.0 |
| Jochen Rindt | Lotus - Ford | 44.0 | Fuel Pump | 2.0 |
| John Surtees | BRM | 40.0 | Engine | 18.0 |
| Pedro Rodríguez | BRM | 38.0 | Water Leak | 15.0 |
| Chris Amon | Ferrari | 34.0 | Engine | 5.0 |
| Jack Brabham | Brabham - Ford | 32.0 | Handling | 1.0 |
| Mario Andretti | Lotus - Ford | 31.0 | Gearbox | 6.0 |
| John Love | Lotus - Ford | 31.0 | Ignition | 10.0 |
| Jacky Ickx | Brabham - Ford | 20.0 | Ignition | 13.0 |
| Basil van Rooyen | McLaren - Ford | 12.0 | Brakes | 9.0 |
Question:
What is the average grid for jo siffert?
Answer:
12.0