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 | Tournament | Winning score | Margin of victory | Runner(s)-up |
| --- | --- | --- | --- | --- |
| 16 Apr 1989 | Credit Lyonnais Cannes Open | –9 (65-70-72=207) | 1 stroke | Jimmy Heggarty , Brett Ogle , Peter Senior |
| 11 Aug 1991 | European Pro-Celebrity | –16 (67-70-69-66=272) | 7 strokes | Ronan Rafferty |
| 9 May 1993 | Benson & Hedges International Open | –12 (69-69-67-71=276) | 1 stroke | Mark James , José María Olazábal |
| 25 Jun 1995 | Peugeot Open de France | –14 (67-75-69-63=274) | 8 strokes | Neal Briggs |
| 3 Apr 2005 | Portuguese Open | –13 (68-66-70-67=271) | 1 stroke | Paul Lawrie |
| 2 Apr 2006 | Portuguese Open | –17 (64-69-71-67=271) | 1 stroke | Anthony Wall |
Question:
What day was the winning score –16 (67-70-69-66=272)?
Answer:
11 Aug 1991