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:
| Home team | Score | Visiting team | Location | Venue | Door | Surface |
| --- | --- | --- | --- | --- | --- | --- |
| Kazakhstan | 3 – 1 | Uzbekistan | Astana | National Tennis Centre | Indoor | Clay |
| Germany | 3 – 2 | Australia | Hamburg | Rothenbaum Stadium | Outdoor | Clay |
| Japan | 2 – 3 | Israel | Tokyo | Ariake Coliseum | Outdoor | Hard |
| Belgium | 5 – 0 | Sweden | Brussels | Royal Primerose Tennis Club | Outdoor | Clay |
| Canada | 4 – 1 | South Africa | Montreal | Uniprix Stadium | Outdoor | Hard |
| Brazil | 5 – 0 | Russia | São José do Rio Preto | Harmonia Tênis Clube | Outdoor | Clay |
| Italy | 4 – 1 | Chile | Napoli | Tennis Club Napoli | Outdoor | Clay |
| Netherlands | 2 – 3 | Switzerland | Amsterdam | Westergasfabriek | Outdoor | Clay |
Question:
what was the surface at most of the games?
Answer:
Clay