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:
| Minister | Party | Start date | End date | Prime Minister |
| --- | --- | --- | --- | --- |
| Antoine Wehenkel | LSAP | 15 July 1964 | 6 February 1969 | Pierre Werner |
| Marcel Mart | DP | 6 February 1969 | 15 June 1974 | Pierre Werner |
| Marcel Mart | DP | 15 June 1974 | 16 September 1977 | Gaston Thorn |
| Gaston Thorn | DP | 16 September 1977 | 16 July 1979 | Gaston Thorn |
| Gaston Thorn | DP | 16 July 1979 | 22 November 1980 | Pierre Werner |
| Colette Flesch | DP | 22 November 1980 | 20 July 1984 | Pierre Werner |
| Jacques Poos | LSAP | 20 July 1984 | 14 July 1989 | Jacques Santer |
| Robert Goebbels | LSAP | 14 July 1989 | 26 January 1995 | Jacques Santer |
| Robert Goebbels | LSAP | 26 January 1995 | 7 August 1999 | Jean-Claude Juncker |
| Henri Grethen | PD | 7 August 1999 | 31 July 2004 | Jean-Claude Juncker |
| Jeannot Krecké | LSAP | 31 July 2004 | Present day | Jean-Claude Juncker |
Question:
Name the start date with party of pd
Answer:
7 August 1999