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 |
| --- | --- | --- | --- | --- |
| 1976.0 | Team Ensign | Ensign N176 | Cosworth V8 | 0.0 |
| 1976.0 | Walter Wolf Racing | Williams FW05 | Cosworth V8 | 0.0 |
| 1977.0 | Durex Team Surtees | Surtees TS19 | Cosworth V8 | 0.0 |
| 1977.0 | ATS Racing Team | Penske PC4 | Cosworth V8 | 0.0 |
| 1978.0 | ATS Racing Team | ATS HS1 | Cosworth V8 | 0.0 |
Question:
What's the top year with the Chassis ats hs1?
Answer:
1978.0