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:
| NBR number | Year | Original operator | Class | Wheel arrangement | Road number | Location |
| --- | --- | --- | --- | --- | --- | --- |
| 22880.0 | 1922.0 | New Zealand Railways | A B | 4-6-2 | 745.0 | Stratford |
| 23190.0 | 1925.0 | New Zealand Railways | A B | 4-6-2 | 832.0 | Glenbrook Vintage Railway |
| 24534.0 | 1939.0 | New Zealand Railways | J | 4-8-2 | 1211.0 | Parnell |
| 24557.0 | 1939.0 | New Zealand Railways | J | 4-8-2 | 1234.0 | Glenbrook Vintage Railway |
| 24559.0 | 1939.0 | New Zealand Railways | J B | 4-8-2 | 1236.0 | Plimmerton |
| 27104.0 | 1951.0 | New Zealand Railways | J A | 4-8-2 | 1275.0 | Parnell |
| 27368.0 | 1953.0 | South African Railways | 25NC | 4-8-4 | 3508.0 | Parnell |
Question:
How many road numbers are before 1922?
Answer:
0.0