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:
| Lot No. | Diagram | Built | Builder | Fleet numbers |
| --- | --- | --- | --- | --- |
| 30485.0 | 97.0 | 1957–1958 | York | 1801–1812 |
| 30507.0 | 98.0 | 1960 | Wolverton | 1838–1852 |
| 30520.0 | 99.0 | 1960 | Wolverton | 1813–1837 |
| 30670.0 | 99.0 | 1961–1962 | Wolverton | 1853–1864 |
| 30702.0 | 99.0 | 1962 | Wolverton | 1865–1882 |
Question:
What is the total diagram for builder york?
Answer:
97.0