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 |
| --- | --- | --- | --- | --- |
| April 5 | Athens , Greece | Greece | 4:1 | Friendly |
| April 29 | Paris, France | France | 0:0 | 1990 WCQ |
| May 25 | Brussels , Belgium | Belgium | 0:1 | Friendly |
| June 14 | Oslo , Norway | Norway | 2:1 | 1990 WCQ |
| August 23 | Kuopio , Finland | Finland | 2:2 | Friendly |
| September 6 | Zagreb | Scotland | 3:1 | 1990 WCQ |
| September 20 | Novi Sad | Greece | 3:0 | Friendly |
| October 11 | Sarajevo | Norway | 1:0 | 1990 WCQ |
| October 28 | Athens , Greece | Cyprus | 2:1 | 1990 WCQ |
| November 14 | João Pessoa , Brazil | Brazil | 0:0 | Friendly |
| December 13 | London, England | England | 1:2 | Friendly |
Question:
When was the game played in Zagreb?
Answer:
September 6