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:
| Round | Grand Prix | Date | Location | Pole Position | Fastest Lap | Winning Driver | Winning Constructor | Report |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | South African Grand Prix | 1 March | Kyalami | Nigel Mansell | Nigel Mansell | Nigel Mansell | Williams - Renault | Report |
| 2.0 | Mexican Grand Prix | 22 March | Hermanos Rodríguez | Nigel Mansell | Gerhard Berger | Nigel Mansell | Williams - Renault | Report |
| 3.0 | Brazilian Grand Prix | 5 April | Interlagos | Nigel Mansell | Riccardo Patrese | Nigel Mansell | Williams - Renault | Report |
| 4.0 | Spanish Grand Prix | 3 May | Catalunya | Nigel Mansell | Nigel Mansell | Nigel Mansell | Williams - Renault | Report |
| 5.0 | San Marino Grand Prix | 17 May | Imola | Nigel Mansell | Riccardo Patrese | Nigel Mansell | Williams - Renault | Report |
| 6.0 | Monaco Grand Prix | 31 May | Monaco | Nigel Mansell | Nigel Mansell | Ayrton Senna | McLaren - Honda | Report |
| 7.0 | Canadian Grand Prix | 14 June | Circuit Gilles Villeneuve | Ayrton Senna | Gerhard Berger | Gerhard Berger | McLaren - Honda | Report |
| 8.0 | French Grand Prix | 5 July | Magny-Cours | Nigel Mansell | Nigel Mansell | Nigel Mansell | Williams - Renault | Report |
| 9.0 | British Grand Prix | 12 July | Silverstone | Nigel Mansell | Nigel Mansell | Nigel Mansell | Williams - Renault | Report |
| 10.0 | German Grand Prix | 26 July | Hockenheimring | Nigel Mansell | Riccardo Patrese | Nigel Mansell | Williams - Renault | Report |
| 11.0 | Hungarian Grand Prix | 16 August | Hungaroring | Riccardo Patrese | Nigel Mansell | Ayrton Senna | McLaren - Honda | Report |
| 12.0 | Belgian Grand Prix | 30 August | Spa-Francorchamps | Nigel Mansell | Michael Schumacher | Michael Schumacher | Benetton - Ford | Report |
| 13.0 | Italian Grand Prix | 13 September | Monza | Nigel Mansell | Nigel Mansell | Ayrton Senna | McLaren - Honda | Report |
| 14.0 | Portuguese Grand Prix | 27 September | Estoril | Nigel Mansell | Ayrton Senna | Nigel Mansell | Williams - Renault | Report |
| 15.0 | Japanese Grand Prix | 25 October | Suzuka | Nigel Mansell | Nigel Mansell | Riccardo Patrese | Williams - Renault | Report |
Question:
what of the total number of date where grand prix is portuguese grand prix
Answer:
1.0