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:
| Date | City | Opponent | Results¹ | Type of game |
| --- | --- | --- | --- | --- |
| June 17 | Zaragoza , Spain | Northern Ireland | 0:0 | WC Round 1 |
| June 20 | Valencia, Spain | Spain | 1:2 | WC Round 1 |
| June 24 | Zaragoza , Spain | Honduras | 1:0 | WC Round 1 |
| October 13 | Oslo , Norway | Norway | 1:3 | Euro '84 Qualifying |
| November 17 | Sofia , Bulgaria | Bulgaria | 1:0 | Euro '84 Qualifying |
| December 15 | Podgorica | Wales | 4:4 | Euro '84 Qualifying |
Question:
On what Date was Wales the Opponent?
Answer:
December 15