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:
| Year | Competition | Venue | Position | Event | Time |
| --- | --- | --- | --- | --- | --- |
| 1983.0 | World Championships | Helsinki | 2nd | 4x100 m relay | 38.37 |
| 1983.0 | Mediterranean Games | Casablanca | 1st | 4x100 m relay | 38.76 |
| 1983.0 | Mediterranean Games | Casablanca | 3rd | 200 metres | 20.63w |
| 1983.0 | European Cup | London | 1st | 4x100 m relay | 38.86 |
| 1985.0 | European Cup | Moscow | 3rd | 4x100 m relay | 38.88 |
| 1991.0 | Mediterranean Games | Athens | 1st | 4x100 m relay | 39.12 |
| 1991.0 | European Cup | Frankfurt | 3rd | 4x100 m relay | 38.89 |
Question:
What's the lowest Year with a  Venue of casablanca and has the Time of 20.63w?
Answer:
1983.0