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 |
| --- | --- | --- | --- | --- |
| John Surtees | Honda | 68.0 | 1:43:45.0 | 9.0 |
| Jack Brabham | Brabham - Repco | 68.0 | + 0.2 | 2.0 |
| Jim Clark | Lotus - Ford | 68.0 | + 23.1 | 1.0 |
| Jochen Rindt | Cooper - Maserati | 68.0 | + 56.6 | 11.0 |
| Mike Spence | BRM | 67.0 | + 1 Lap | 12.0 |
| Jacky Ickx | Cooper - Maserati | 66.0 | + 2 Laps | 15.0 |
| Chris Amon | Ferrari | 64.0 | + 4 Laps | 4.0 |
| Graham Hill | Lotus - Ford | 58.0 | Engine | 8.0 |
| Jo Siffert | Cooper - Maserati | 50.0 | Accident | 13.0 |
| Giancarlo Baghetti | Lotus - Ford | 50.0 | Engine | 17.0 |
| Bruce McLaren | McLaren - BRM | 46.0 | Engine | 3.0 |
| Jo Bonnier | Cooper - Maserati | 46.0 | Overheating | 14.0 |
| Jackie Stewart | BRM | 45.0 | Engine | 7.0 |
| Denny Hulme | Brabham - Repco | 30.0 | Overheating | 6.0 |
| Guy Ligier | Brabham - Repco | 26.0 | Engine | 18.0 |
| Chris Irwin | BRM | 16.0 | Injection | 16.0 |
| Ludovico Scarfiotti | Eagle - Weslake | 5.0 | Engine | 10.0 |
| Dan Gurney | Eagle - Weslake | 4.0 | Engine | 5.0 |
Question:
What is the total amount of grid when the laps amount was smaller than 68 and the time/retired was injection?
Answer:
16.0