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:
| Route Number | Origin | Intermediate stops | Destination | Provider |
| --- | --- | --- | --- | --- |
| 318.0 | Birmingham | Cheltenham, Gloucester | Bristol | National Express |
| 325.0 | Birmingham | Wolverhampton , Stoke-on-Trent, Manchester Airport | Manchester | National Express |
| 545.0 | London | Milton Keynes , Birmingham, Stoke-on-Trent & Rhyl | Pwhelli | National Express |
| 550.0 | London | Birmingham, Stoke-on-Trent, Warrington | Liverpool | National Express |
| 570.0 | London | Milton Keynes , Birmingham, St Helens, Preston | Blackpool | National Express |
Question:
How many route numbers occur for the origin of Birmingham and destination of Bristol?
Answer:
1.0