Table:
text: 1951 Swiss Grand Prix
Entries
Entries
No_ Driver Entrant Constructor_ Chassis Engine Tyre_
2 Johnny Claes Ecurie Belge Talbot-Lago Talbot-Lago T26C-DA Talbot 23CV 4.5 L6 D
4 Philippe Étancelin Philippe Étancelin Talbot-Lago Talbot-Lago T26C-DA Talbot 23CV 4.5 L6 D
6 Yves Giraud-Cabantous Yves Giraud-Cabantous Talbot-Lago Talbot-Lago T26C Talbot 23CV 4.5 L6 D
8 Louis Rosier Ecurie Rosier Talbot-Lago Talbot-Lago T26C-DA Talbot 23CV 4.5 L6 D
10 Henri Louveau Ecurie Rosier Talbot-Lago Talbot-Lago T26C Talbot 23CV 4.5 L6 D
12 George Abecassis HW Motors HWM-Alta HWM 51 Alta 1.5 L4s D
14 Stirling Moss HW Motors HWM-Alta HWM 51 Alta 1.5 L4s D

text: 1951 Swiss Grand Prix
Entries
Entries
No_ Driver Entrant Constructor_ Chassis Engine Tyre_
16 Peter Whitehead Scuderia Ferrari Ferrari Ferrari 125 Ferrari 125 F1 1.5 V12s D
18 Luigi Villoresi Scuderia Ferrari Ferrari Ferrari 375 Ferrari Type 375 4.5 V12 P
20 Alberto Ascari Scuderia Ferrari Ferrari Ferrari 375 Ferrari Type 375 4.5 V12 P
22 Nino Farina Alfa Romeo SpA Alfa Romeo Alfa Romeo 159A Alfa Romeo 1.5 L8s P
24 Juan Manuel Fangio Alfa Romeo SpA Alfa Romeo Alfa Romeo 159A Alfa Romeo 1.5 L8s P
26 Toulo de Graffenried Alfa Romeo SpA Alfa Romeo Alfa Romeo 159A Alfa Romeo 1.5 L8s P
28 Consalvo Sanesi Alfa Romeo SpA Alfa Romeo Alfa Romeo 159 Alfa Romeo 1.5 L8s P

text: 1951 Swiss Grand Prix
Entries
Entries
No_ Driver Entrant Constructor_ Chassis Engine Tyre_
30 Louis Chiron Enrico Platé Maserati Maserati 4CLT-48 Maserati 4 CL 1.5 L4s P
32 Harry Schell Enrico Platé Maserati Maserati 4CLT-48 Maserati 4 CL 1.5 L4s P
38 Rudi Fischer Ecurie Espadon Ferrari Ferrari 212 Ferrari Type 375 4.5 V12 P
40 Guy Mairesse Yves Giraud-Cabantous Talbot-Lago Talbot-Lago T26C Talbot 23CV 4.5 L6 D
42 José Froilán González José Froilán González Talbot-Lago Talbot-Lago T26C-GS Talbot 23CV 4.5 L6 D
44 Piero Taruffi Scuderia Ferrari Ferrari Ferrari 375 Ferrari Type 375 4.5 V12 P
46 Francis Rochat Francis Rochat Simca-Gordini Simca-Gordini T11 Simca-Gordini 15C 1.5 L4s E
48 Maurice Trintignant Equipe Gordini Simca-Gordini Simca-Gordini T15 Simca-Gordini 15C 1.5 L4s E

text: 1951 Swiss Grand Prix
Entries
Entries
No_ Driver Entrant Constructor_ Chassis Engine Tyre_
50 André Simon Equipe Gordini Simca-Gordini Simca-Gordini T15 Simca-Gordini 15C 1.5 L4s E
52 Peter Hirt Peter Hirt Veritas Veritas Meteor Veritas 2.0 L6 ?

Question: How many drivers are there in total for the 1951 Swiss Grand Prix?