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 | Scuderia Ferrari | Ferrari 553 | Ferrari Straight-4 | 0 |
| 1954.0 | Scuderia Ferrari | Ferrari 625 | Ferrari Straight-4 | 2 |
| 1954.0 | Scuderia Ferrari | Ferrari 553 | Ferrari Straight-4 | 2 |
| 1955.0 | Scuderia Ferrari | Ferrari 625 | Ferrari Straight-4 | 1 1⁄3 |
| 1955.0 | Scuderia Ferrari | Ferrari 555 | Ferrari Straight-4 | 1 1⁄3 |
| 1956.0 | Scuderia Guastalla | Maserati 250F | Maserati Straight-6 | 0 |
| 1956.0 | Officine Alfieri Maserati | Maserati 250F | Maserati Straight-6 | 0 |
| 1957.0 | Dr Ing F Porsche KG | Porsche 550RS F2 | Porsche Flat-4 | 0 |
Question:
What is the total number of years that Scuderia Guastalla was an entrant?
Answer:
1.0