Table:
text: Mexico national under-20 football team
Mexico under-20 managers
Mexico under-20 managers
Manager Mexico_career Played Drawn Lost Win_
Horacio Casarin 1977 5 4 0 20.0
Mario Velarde 1983 3 1 2 0.00
Jesús del Muro 1985, 1998–1999 12 1 2 75.00
Alfonso Portugal Diaz 1991 4 2 1 25.0
Juan de Dios Castillo 1992–1993 7 2 1 60
Juan Manuel Alvarez 1994 3 0 1 56.6
José Luis Real 1996–1997, 2001 12 3 3 50.00
Eduardo Rergis 2002–2003 6 1 3 33.3
Humberto Grondona 2005 3 0 2 33.3
Jesús Ramírez 2007–2009 8 1 1 75.00
Juan Carlos Chávez 2009–2011 19 3 4 63.15
Sergio Almaguer 2011- 5 0 0 100

Question: What is the highest win percentage that coach Juan Carlos Chávez's side have had while losing fewer than four times in the Mexico national under-20 football team?