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:
| Entrant | Constructor | Chassis | Engine | Tyre | Driver | Rounds |
| --- | --- | --- | --- | --- | --- | --- |
| Scuderia Ferrari SpA SEFAC | Ferrari | 156 | Ferrari 178 1.5 V6 | D | Phil Hill | 1–3, 5–7 |
| Scuderia Ferrari SpA SEFAC | Ferrari | 156 | Ferrari 178 1.5 V6 | D | Giancarlo Baghetti | 1, 3, 6–7 |
| Scuderia Ferrari SpA SEFAC | Ferrari | 156 | Ferrari 178 1.5 V6 | D | Ricardo Rodríguez | 1–3, 6–7 |
| Scuderia Ferrari SpA SEFAC | Ferrari | 156 | Ferrari 178 1.5 V6 | D | Lorenzo Bandini | 2, 6–7 |
| Scuderia Ferrari SpA SEFAC | Ferrari | 156 | Ferrari 178 1.5 V6 | D | Willy Mairesse | 2–3, 7 |
| Team Lotus | Lotus-Climax | 25\n24 | Climax FWMV 1.5 V8 | D | Jim Clark | All |
| Team Lotus | Lotus-Climax | 25\n24 | Climax FWMV 1.5 V8 | D | Trevor Taylor | All |
| Cooper Car Company | Cooper-Climax | T60\nT55 | Climax FWMV 1.5 V8\nClimax FPF 1.5 L4 | D | Bruce McLaren | All |
| Cooper Car Company | Cooper-Climax | T60\nT55 | Climax FWMV 1.5 V8\nClimax FPF 1.5 L4 | D | Tony Maggs | All |
| Cooper Car Company | Cooper-Climax | T60\nT55 | Climax FWMV 1.5 V8\nClimax FPF 1.5 L4 | D | Timmy Mayer | 8 |
| Brabham Racing Organisation | Lotus-Climax | 24 | Climax FWMV 1.5 V8 | D | Jack Brabham | 1–5 |
| Brabham Racing Organisation | Brabham-Climax | BT3 | Climax FWMV 1.5 V8 | D | Jack Brabham | 6, 8–9 |
| UDT Laystall Racing Team | Lotus-Climax | 24\n18/21 | Climax FWMV 1.5 V8\nClimax FPF 1.5 L4 | D | Innes Ireland | 1–5, 7–9 |
| UDT Laystall Racing Team | Lotus-Climax | 24\n18/21 | Climax FWMV 1.5 V8\nClimax FPF 1.5 L4 | D | Masten Gregory | 1, 5 |
| UDT Laystall Racing Team | Lotus-BRM | 24 | BRM P56 1.5 V8 | D | Masten Gregory | 2–4, 7–8 |
| Porsche System Engineering | Porsche | 804\n718 | Porsche 753 1.5 F8\nPorsche 547/6 1.5 F4 | D | Jo Bonnier | 1–2, 4–8 |
| Porsche System Engineering | Porsche | 804\n718 | Porsche 753 1.5 F8\nPorsche 547/6 1.5 F4 | D | Dan Gurney | 1–2, 5–8 |
| Porsche System Engineering | Porsche | 804\n718 | Porsche 753 1.5 F8\nPorsche 547/6 1.5 F4 | D | Phil Hill | 8 |
| Ecurie Maarsbergen | Porsche | 718\n787 | Porsche 547/6 1.5 F4 | D | Carel Godin de Beaufort | All |
| Ecurie Maarsbergen | Porsche | 718\n787 | Porsche 547/6 1.5 F4 | D | Ben Pon | 1 |
| Ecurie Maarsbergen | Emeryson-Climax | 61 | Climax FPF 1.5 L4 | D | Wolfgang Seidel | 1 |
| Owen Racing Organisation | BRM | P57\nP48/57 | BRM P56 1.5 V8 | D | Graham Hill | All |
| Owen Racing Organisation | BRM | P57\nP48/57 | BRM P56 1.5 V8 | D | Richie Ginther | All |
| Bowmaker-Yeoman Racing Team | Lola-Climax | Mk 4 | Climax FWMV 1.5 V8 | D | John Surtees | All |
| Bowmaker-Yeoman Racing Team | Lola-Climax | Mk 4 | Climax FWMV 1.5 V8 | D | Roy Salvadori | 1–2, 4–9 |
| Ecurie Galloise | Cooper-Climax | T53 | Climax FPF 1.5 L4 | D | Jackie Lewis | 1–2, 4–6 |
| R.R.C. Walker Racing Team | Lotus-Climax | 24 | Climax FWMV 1.5 V8 | D | Maurice Trintignant | 2–4, 6–8 |
| Scuderia SSS Republica di Venezia | Lotus-Climax | 18/21\n24 | Climax FPF 1.5 L4 | D | Nino Vaccarella | 2, 7 |
| Scuderia SSS Republica di Venezia | Porsche | 718 | Porsche 547/3 1.5 F4 | D | Nino Vaccarella | 6 |
| Ecurie Nationale Suisse | Lotus-Climax | 21 | Climax FPF 1.5 L4 | D | Jo Siffert | 2 |
| Emeryson Cars | Lotus-Climax | 18 | Climax FPF 1.5 L4 | D | John Campbell-Jones | 3 |
| Emeryson Cars | Emeryson-Climax | 61 | Climax FPF 1.5 L4 | D | Tony Settember | 5, 7 |
| Equipe Nationale Belge | Lotus-Climax | 18/21 | Climax FPF 1.5 L4 | D | Lucien Bianchi | 3, 6 |
| Ecurie Filipinetti | Lotus-Climax | 21 | Climax FPF 1.5 L4 | D | Jo Siffert | 3, 6 |
| Ecurie Filipinetti | Lotus-BRM | 24 | BRM P56 1.5 V8 | D | Jo Siffert | 4, 7 |
| Ecurie Filipinetti | Lotus-BRM | 24 | BRM P56 1.5 V8 | D | Heinz Schiller | 6 |
| Ecurie Filipinetti | Porsche | 718 | Porsche 547/3 1.5 F4 | D | Heini Walter | 6 |
| Autosport Team Wolfgang Seidel | Lotus-BRM | 24 | BRM P56 1.5 V8 | D | Dan Gurney | 3 |
| Autosport Team Wolfgang Seidel | Lotus-BRM | 24 | BRM P56 1.5 V8 | D | Wolfgang Seidel | 5–6 |
| Autosport Team Wolfgang Seidel | Lotus-BRM | 24 | BRM P56 1.5 V8 | D | Gunther Seiffert | 6 |
| Autosport Team Wolfgang Seidel | Lotus-BRM | 24 | BRM P56 1.5 V8 | D | Tony Shelly | 7 |
| Anglo-American Equipe | Cooper-Climax | T59 | Climax FPF 1.5 L4 | D | Ian Burgess | 5–7 |
| Ecurie Excelsior | Lotus-Climax | 18 | Climax FPF 1.5 L4 | D | Jay Chamberlain | 5–7 |
| John Dalton | Lotus-Climax | 18/21 | Climax FPF 1.5 L4 | D | Tony Shelly | 5–6 |
| Gilby Engineering | Gilby-BRM | 62 | BRM P56 1.5 V8 | D | Keith Greene | 6–7 |
| Bernard Collomb | Cooper-Climax | T53 | Climax FPF 1.5 L4 | D | Bernard Collomb | 6 |
| Scuderia de Tomaso | De Tomaso | F1 | De Tomaso 1.5 F8 | D | Nasif Estéfano | 7 |
| Scuderia Settecolli | De Tomaso-OSCA | F1 | OSCA 372 1.5 L4 | D | Roberto Lippi | 7 |
| Gerry Ashmore | Lotus-Climax | 18/21 | Climax FPF 1.5 L4 | D | Gerry Ashmore | 7 |
| Scuderia Jolly Club | Lotus-Climax | 18 | Climax FPF 1.5 L4 | D | Ernesto Prinoth | 7 |
| Dupont Team Zerex | Lotus-Climax | 24 | Climax FWMV 1.5 V8 | D | Roger Penske | 8 |
| Hap Sharp | Cooper-Climax | T53 | Climax FPF 1.5 L4 | D | Hap Sharp | 8 |
| Jim Hall | Lotus-Climax | 21 | Climax FPF 1.5 L4 | D | Jim Hall | 8 |
| John Mecom | Lotus-Climax | 24 | Climax FPF 1.5 L4 | D | Rob Schroeder | 8 |
| Bruce Johnstone | BRM | P48/57 | BRM P56 1.5 V8 | D | Bruce Johnstone | 9 |
| Ernie Pieterse | Lotus-Climax | 21 | Climax FPF 1.5 L4 | D | Ernie Pieterse | 9 |
| John Love | Cooper-Climax | T55 | Climax FPF 1.5 L4 | D | John Love | 9 |
| Neville Lederle | Lotus-Climax | 21 | Climax FPF 1.5 L4 | D | Neville Lederle | 9 |
| Otello Nucci | LDS-Alfa Romeo | Mk 1 | Alfa Romeo Giulietta 1.5 L4 | D | Doug Serrurier | 9 |
| Mike Harris | Cooper-Alfa Romeo | T53 | Alfa Romeo Giulietta 1.5 L4 | D | Mike Harris | 9 |
Question:
how many drivers drove all the rounds?
Answer:
8