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 |
| --- | --- | --- | --- | --- |
| Jo Siffert | BRM | 54.0 | 1:30:23.91 | 1.0 |
| Emerson Fittipaldi | Lotus - Ford | 54.0 | + 4.12 | 5.0 |
| Tim Schenken | Brabham - Ford | 54.0 | + 19.77 | 7.0 |
| Reine Wisell | Lotus - Ford | 54.0 | + 31.87 | 10.0 |
| Graham Hill | Brabham - Ford | 54.0 | + 48.43 | 8.0 |
| Henri Pescarolo | March - Ford | 54.0 | + 1:24.51 | 13.0 |
| Rolf Stommelen | Surtees - Ford | 54.0 | + 1:37.42 | 12.0 |
| Ronnie Peterson | March - Ford | 53.0 | +1 Lap | 11.0 |
| Jackie Oliver | McLaren - Ford | 53.0 | +1 Lap | 22.0 |
| Peter Gethin | BRM | 52.0 | +2 Laps | 16.0 |
| Helmut Marko | BRM | 52.0 | +2 Laps | 17.0 |
| Nanni Galli | March - Alfa Romeo | 51.0 | +3 Laps | 15.0 |
| Mike Beuttler | March - Ford | 47.0 | Not Classified | 19.0 |
| François Cevert | Tyrrell - Ford | 42.0 | Engine | 3.0 |
| Jackie Stewart | Tyrrell - Ford | 35.0 | Halfshaft | 2.0 |
| Jacky Ickx | Ferrari | 31.0 | Engine | 6.0 |
| Niki Lauda | March - Ford | 20.0 | Handling | 21.0 |
| John Surtees | Surtees - Ford | 12.0 | Engine | 18.0 |
| Clay Regazzoni | Ferrari | 8.0 | Engine | 4.0 |
| Howden Ganley | BRM | 5.0 | Ignition | 14.0 |
| Denny Hulme | McLaren - Ford | 4.0 | Engine | 9.0 |
| Jo Bonnier | McLaren - Ford | 0.0 | Fuel Leak | 20.0 |
Question:
What is the average grid that has over 8 laps, a Time/Retired of +2 laps, and peter gethin driving?
Answer:
16.0