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:
| Pilot car No. | Colour | Serial No. | Engine No. | Registration No. |
| --- | --- | --- | --- | --- |
| 1.0 | Gawler Cream (Body No. six) | 8-1001-M | 1001.0 | MG-501 |
| 2.0 | Black | 8-1002-M | 1002.0 | MG-502 |
| 3.0 | Black | 8-1003-M | 1003.0 | MG-503 |
| 4.0 | Black | 8-1004-M | 1004.0 | MG-504 |
| 5.0 | Black | 8-1005-M | 1005.0 | MG-505 |
| 6.0 | Seine Blue | 8-1006-M | 1006.0 | MG-506 |
| 7.0 | Convoy Grey | 8-1007-M | 1007.0 | MG-507 |
| 8.0 | Black | 8-1008-M | 1008.0 | MG-508 |
| 9.0 | Black | 8-1009-M | 1009.0 | MG-509 |
Question:
What is the number of colour with the regisration number of mg-509?
Answer:
1.0