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 |
| --- | --- | --- | --- | --- | --- | --- |
| John Player Team Lotus | Lotus - Ford | 72D 72E | Ford Cosworth DFV 3.0 V8 | G | Emerson Fittipaldi | All |
| John Player Team Lotus | Lotus - Ford | 72D 72E | Ford Cosworth DFV 3.0 V8 | G | Ronnie Peterson | All |
| Elf Team Tyrrell | Tyrrell - Ford | 005 006 | Ford Cosworth DFV 3.0 V8 | G | Jackie Stewart | All |
| Elf Team Tyrrell | Tyrrell - Ford | 005 006 | Ford Cosworth DFV 3.0 V8 | G | François Cevert | All |
| Elf Team Tyrrell | Tyrrell - Ford | 005 006 | Ford Cosworth DFV 3.0 V8 | G | Chris Amon | 14-15 |
| Motor Racing Developments | Brabham - Ford | BT37 BT42 | Ford Cosworth DFV 3.0 V8 | G | Carlos Reutemann | All |
| Motor Racing Developments | Brabham - Ford | BT37 BT42 | Ford Cosworth DFV 3.0 V8 | G | Wilson Fittipaldi | All |
| Motor Racing Developments | Brabham - Ford | BT37 BT42 | Ford Cosworth DFV 3.0 V8 | G | Andrea de Adamich | 4-6, 8-9 |
| Motor Racing Developments | Brabham - Ford | BT37 BT42 | Ford Cosworth DFV 3.0 V8 | G | Rolf Stommelen | 11-14 |
| Motor Racing Developments | Brabham - Ford | BT37 BT42 | Ford Cosworth DFV 3.0 V8 | G | John Watson | 9, 15 |
| Yardley Team McLaren | McLaren - Ford | M19A M19C M23 | Ford Cosworth DFV 3.0 V8 | G | Denny Hulme | All |
| Yardley Team McLaren | McLaren - Ford | M19A M19C M23 | Ford Cosworth DFV 3.0 V8 | G | Peter Revson | 1-7, 9-15 |
| Yardley Team McLaren | McLaren - Ford | M19A M19C M23 | Ford Cosworth DFV 3.0 V8 | G | Jody Scheckter | 3, 8-9, 14-15 |
| Yardley Team McLaren | McLaren - Ford | M19A M19C M23 | Ford Cosworth DFV 3.0 V8 | G | Jacky Ickx | 11 |
| Scuderia Ferrari SpA SEFAC | Ferrari | 312B2 312B3 | Ferrari 001/1 3.0 F12 Ferrari 001/11 3.0 F12 | G | Jacky Ickx | 1-9, 13 |
| Scuderia Ferrari SpA SEFAC | Ferrari | 312B2 312B3 | Ferrari 001/1 3.0 F12 Ferrari 001/11 3.0 F12 | G | Arturo Merzario | 1-3, 6, 8, 12-15 |
| Clarke-Mordaunt-Guthrie Racing Team Pierre Robert | March - Ford | 721G 731 | Ford Cosworth DFV 3.0 V8 | F G | Mike Beuttler | 1-7, 9-15 |
| Clarke-Mordaunt-Guthrie Racing Team Pierre Robert | March - Ford | 721G 731 | Ford Cosworth DFV 3.0 V8 | F G | Reine Wisell | 7-8 |
| STP March Racing Team | March - Ford | 721G 731 | Ford Cosworth DFV 3.0 V8 | G | Jean-Pierre Jarier | 1-3, 5-8, 12, 14-15 |
| STP March Racing Team | March - Ford | 721G 731 | Ford Cosworth DFV 3.0 V8 | G | Henri Pescarolo | 4 |
| STP March Racing Team | March - Ford | 721G 731 | Ford Cosworth DFV 3.0 V8 | G | Roger Williamson | 9-10 |
| Brooke Bond Oxo Team Surtees | Surtees - Ford | TS9A TS9B TS14A | Ford Cosworth DFV 3.0 V8 | F | Mike Hailwood | All |
| Brooke Bond Oxo Team Surtees | Surtees - Ford | TS9A TS9B TS14A | Ford Cosworth DFV 3.0 V8 | F | José Carlos Pace | All |
| Brooke Bond Oxo Team Surtees | Surtees - Ford | TS9A TS9B TS14A | Ford Cosworth DFV 3.0 V8 | F | Luiz Bueno | 2 |
| Brooke Bond Oxo Team Surtees | Surtees - Ford | TS9A TS9B TS14A | Ford Cosworth DFV 3.0 V8 | F | Andrea de Adamich | 3 |
| Brooke Bond Oxo Team Surtees | Surtees - Ford | TS9A TS9B TS14A | Ford Cosworth DFV 3.0 V8 | F | Jochen Mass | 9, 11, 15 |
| Marlboro BRM | BRM | P160C P160D | BRM P142 3.0 V12 | F | Jean-Pierre Beltoise | All |
| Marlboro BRM | BRM | P160C P160D | BRM P142 3.0 V12 | F | Clay Regazzoni | 1-13, 15 |
| Marlboro BRM | BRM | P160C P160D | BRM P142 3.0 V12 | F | Niki Lauda | All |
| Marlboro BRM | BRM | P160C P160D | BRM P142 3.0 V12 | F | Peter Gethin | 14 |
| Frank Williams Racing Cars | Iso-Marlboro - Ford | FX3B IR | Ford Cosworth DFV 3.0 V8 | F | Nanni Galli | 1-2, 4-6 |
| Frank Williams Racing Cars | Iso-Marlboro - Ford | FX3B IR | Ford Cosworth DFV 3.0 V8 | F | Howden Ganley | All |
| Frank Williams Racing Cars | Iso-Marlboro - Ford | FX3B IR | Ford Cosworth DFV 3.0 V8 | F | Jackie Pretorius | 3 |
| Frank Williams Racing Cars | Iso-Marlboro - Ford | FX3B IR | Ford Cosworth DFV 3.0 V8 | F | Tom Belsø | 7 |
| Frank Williams Racing Cars | Iso-Marlboro - Ford | FX3B IR | Ford Cosworth DFV 3.0 V8 | F | Henri Pescarolo | 8, 11 |
| Frank Williams Racing Cars | Iso-Marlboro - Ford | FX3B IR | Ford Cosworth DFV 3.0 V8 | F | Graham McRae | 9 |
| Frank Williams Racing Cars | Iso-Marlboro - Ford | FX3B IR | Ford Cosworth DFV 3.0 V8 | F | Gijs van Lennep | 10, 12-13 |
| Frank Williams Racing Cars | Iso-Marlboro - Ford | FX3B IR | Ford Cosworth DFV 3.0 V8 | F | Tim Schenken | 14 |
| Frank Williams Racing Cars | Iso-Marlboro - Ford | FX3B IR | Ford Cosworth DFV 3.0 V8 | F | Jacky Ickx | 15 |
| UOP Shadow Racing Team | Shadow - Ford | DN1 | Ford Cosworth DFV 3.0 V8 | G | Jackie Oliver | 3-15 |
| UOP Shadow Racing Team | Shadow - Ford | DN1 | Ford Cosworth DFV 3.0 V8 | G | George Follmer | 3-15 |
| UOP Shadow Racing Team | Shadow - Ford | DN1 | Ford Cosworth DFV 3.0 V8 | G | Brian Redman | 15 |
| Scribante Lucky Strike Racing | Lotus - Ford | 72D | Ford Cosworth DFV 3.0 V8 | F | Dave Charlton | 3 |
| Blignaut Lucky Strike Racing | Tyrrell - Ford | 004 | Ford Cosworth DFV 3.0 V8 | G | Eddie Keizan | 3 |
| Embassy Racing | Shadow - Ford | DN1 | Ford Cosworth DFV 3.0 V8 | G | Graham Hill | 4-15 |
| Martini Racing Team | Tecno | PA123/6 | Tecno Series-P 3.0 F12 | F | Chris Amon | 5-6, 9-10, 12 |
| LEC Refrigeration Racing | March - Ford | 731 | Ford Cosworth DFV 3.0 V8 | G | David Purley | 6, 9-11, 13 |
| Hesketh Racing | March - Ford | 731 | Ford Cosworth DFV 3.0 V8 | G | James Hunt | 6, 8-10, 12, 14-15 |
| Team Ensign | Ensign - Ford | N173 | Ford Cosworth DFV 3.0 V8 | F | Rikky von Opel | 8-10, 12-15 |
Question:
None of the rounds has Roger Williamson as a driver.
Answer:
9-10