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:
| Year | Entrant | Chassis | Engine | Points |
| --- | --- | --- | --- | --- |
| 1953.0 | Equipe Gordini | Gordini Type 16 | Gordini Straight-6 | 0.0 |
| 1954.0 | Onofre Marimón | Maserati A6GCM/250F | Maserati Straight-6 | 0.0 |
| 1955.0 | Officine Alfieri Maserati | Maserati 250F | Maserati Straight-6 | 2.0 |
| 1956.0 | Officine Alfieri Maserati | Maserati 250F | Maserati Straight-6 | 0.0 |
| 1957.0 | Officine Alfieri Maserati | Maserati 250F | Maserati Straight-6 | 4.0 |
| 1958.0 | Scuderia Sud Americana | Maserati 250F | Maserati Straight-6 | 0.0 |
| 1960.0 | Scuderia Centro Sud | Cooper T51 | Maserati Straight-4 | 3.0 |
Question:
What is the average year for Maserati Straight-4 Engines?
Answer:
1960.0