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:
| Rnd | Circuit | LMP1 Winning Team\nLMP1 Winning Drivers | LMP2 Winning Team\nLMP2 Winning Drivers | GT1 Winning Team\nGT1 Winning Drivers | GT2 Winning Team\nGT2 Winning Drivers | Results |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | Sebring | #2 Audi Sport North America | #37 Intersport Racing | #4 Corvette Racing | #50 Multimatic Motorsports | Results |
| 1 | Sebring | Rinaldo Capello\n Tom Kristensen\n Allan McNish | Clint Field\n Liz Halliday\n Jon Field | Oliver Gavin\n Olivier Beretta\n Jan Magnussen | Scott Maxwell\n David Brabham\n Sébastien Bourdais | Results |
| 2 | Reliant Park | #2 Audi Sport North America | #37 Intersport Racing | #4 Corvette Racing | #23 Alex Job Racing | Results |
| 2 | Reliant Park | Allan McNish\n Rinaldo Capello | Clint Field\n Liz Halliday | Oliver Gavin\n Olivier Beretta | Mike Rockenfeller\n Klaus Graf | Results |
| 3 | Mid-Ohio | #2 Audi Sport North America | #7 Penske Racing | #4 Corvette Racing | #45 Flying Lizard Motorsports | Results |
| 3 | Mid-Ohio | Allan McNish\n Rinaldo Capello | Timo Bernhard\n Romain Dumas | Oliver Gavin\n Olivier Beretta | Johannes van Overbeek\n Wolf Henzler | Results |
| 4 | Lime Rock | #2 Audi Sport North America | #7 Penske Racing | #009 Aston Martin Racing | #31 Petersen/White Lightning | Results |
| 4 | Lime Rock | Allan McNish\n Rinaldo Capello | Timo Bernhard\n Romain Dumas | Stéphane Sarrazin\n Pedro Lamy | Jörg Bergmeister\n Patrick Long | Results |
| 5 | Miller | #1 Audi Sport North America | #6 Penske Racing | #007 Aston Martin Racing | #62 Risi Competizione | Results |
| 5 | Miller | Frank Biela\n Emanuele Pirro | Sascha Maassen\n Lucas Luhr | Darren Turner\n Tomáš Enge | Jaime Melo\n Mika Salo | Results |
| 6 | Portland | #2 Audi Sport North America | #37 Intersport Racing | #4 Corvette Racing | #62 Risi Competizione | Results |
| 6 | Portland | Allan McNish\n Rinaldo Capello | Clint Field\n Liz Halliday | Oliver Gavin\n Olivier Beretta | Jaime Melo\n Mika Salo | Results |
| 7 | Road America | #1 Audi Sport North America | #6 Penske Racing | #3 Corvette Racing | #31 Petersen/White Lightning | Results |
| 7 | Road America | Frank Biela\n Emanuele Pirro | Sascha Maassen\n Timo Bernhard | Ron Fellows\n Johnny O'Connell | Jörg Bergmeister\n Patrick Long\n Michael Petersen | Results |
| 8 | Mosport | #2 Audi Sport North America | #7 Penske Racing | #009 Aston Martin Racing | #62 Risi Competizione | Results |
| 8 | Mosport | Allan McNish\n Rinaldo Capello | Lucas Luhr\n Romain Dumas | Stéphane Sarrazin\n Pedro Lamy | Stephane Ortelli\n Johnny Mowlem | Results |
| 9 | Road Atlanta | #2 Audi Sport North America | #6 Penske Racing | #007 Aston Martin Racing | #31 Petersen/White Lightning | Results |
| 9 | Road Atlanta | Allan McNish\n Rinaldo Capello | Sascha Maassen\n Timo Bernhard\n Emmanuel Collard | Tomáš Enge\n Darren Turner | Jörg Bergmeister\n Patrick Long\n Niclas Jönsson | Results |
| 10 | Mazda Raceway Laguna Seca | #2 Audi Sport North America | #7 Penske Racing | #009 Aston Martin Racing | #62 Risi Competizione | Results |
| 10 | Mazda Raceway Laguna Seca | Allan McNish\n Rinaldo Capello | Lucas Luhr\n Romain Dumas | Stéphane Sarrazin\n Pedro Lamy | Mika Salo\n Stephane Ortelli | Results |
Question:
how many countries participated at reliant park
Answer:
5