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:
| Release format | Country | Label | Cat. No. | Release date |
| --- | --- | --- | --- | --- |
| Vinyl | West Germany | Ariola | 203 450-320 | 1981.0 |
| Cassette | West Germany | Ariola | 403 450-352 | 1981.0 |
| Vinyl | Italy | Ariola | ARL 3155 | 1981.0 |
| Vinyl | Greece | Ariola | 6483 322 | 1981.0 |
| Vinyl | Netherlands | Ariola | 203 450 | 1981.0 |
| Vinyl | Spain | Ariola | I-203450 | 1981.0 |
| Vinyl | Yugoslavia | RTB | 2220717 | 1981.0 |
Question:
How many release dates have a Country of west germany, and a Release format of vinyl?
Answer:
1.0