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:
| Rank | Rider | Team | Speed | Time |
| --- | --- | --- | --- | --- |
| 1.0 | Ewan Hamilton | 242cc Suzuki | 93.937mph | 1:36.23.79 |
| 2.0 | Peter Richardson | 248cc Suzuki | 92.909mph | 1:37.27.77 |
| 3.0 | David Smith | 246cc Suzuki | 92.613mph | 1:37.46.48 |
| 4.0 | Peter Symes | 250cc Suzuki | 92.425mph | 1:37.58.38 |
| 5.0 | Tom Jackson | 248cc Suzuki | 89.932mph | 1:40.41.34 |
| 6.0 | Mervyn Stratford | 247cc Greeves Silverstone | 85.971mph | 1:45.19.70 |
| 7.0 | Roger Jones | 248cc Suzuki | 85.523mph | 1:45.52.84 |
| 8.0 | Tony Mason | 249cc Honda | 83.662mph | 1:45.52.84 |
| 9.0 | Kevin Murphy | 250cc Ducati | 79.320mph | 1:54.09.63 |
Question:
What is the highest rank for Peter Symes?
Answer:
4.0