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:
| Name | Builder | Wheel arrangement | Works Number | Built |
| --- | --- | --- | --- | --- |
| Alpha | W.G. Bagnall | 0-6-2T | 2472.0 | 1932.0 |
| Leader | Kerr Stuart | 0-4-2ST | 926.0 | 1905.0 |
| Melior | Kerr Stuart | 0-4-2ST | 4219.0 | 1924.0 |
| Premier | Kerr Stuart | 0-4-2ST | 886.0 | 1905.0 |
| Superb | W.G. Bagnall | 0-6-2T | 2624.0 | 1922.0 |
| Triumph | W.G. Bagnall | 0-6-2T | 2511.0 | 1934.0 |
| Unique | W.G. Bagnall | 2-4-0 F | 2216.0 | 1924.0 |
| Victor | Hudson Hunslet | 4wDM | 4182.0 | 1953.0 |
| Edward Lloyd | Ruston & Hornsby | 0-4-0 DM | 435403.0 | 1961.0 |
| Barton Hall | Hunslet | 4wDH | 6651.0 | 1965.0 |
| No 1 | Andrew Barclay and Sons | 0-4-0F | 1876.0 | 1925.0 |
| No 3, Bear | Peckett and Sons | 0-4-0ST | 614.0 | 1896.0 |
Question:
What is the average building year for Superb?
Answer:
1922.0