Table:
text: List of football stadiums in Argentina
List
List
Stadium Capacity City Province Home_teams
Monumental Antonio V. Liberti 67664 Buenos Aires ( autonomous city ) River Plate and Argentina
Mario Alberto Kempes 57878 Córdoba Córdoba –
Ciudad de La Plata 53000 La Plata Buenos Aires Estudiantes (LP)
Presidente Juan Domingo Perón 51389 Avellaneda Buenos Aires Racing Club
José Amalfitani 49540 Buenos Aires ( autonomous city ) Vélez Sársfield
Alberto J. Armando 49000 Buenos Aires ( autonomous city ) Boca Juniors
Tomás Adolfo Ducó 48314 Buenos Aires ( autonomous city ) Huracán
Ciudad de Lanús 47027 Lanús Buenos Aires Lanús
Libertadores de América 44000 Avellaneda Buenos Aires Independiente

Question: What was the average capacity for vélez sársfield among the list of soccer stadiums in Argentina?