0185-2760 0185-2760 S0185-27602006000200037 Mexico 00 06 2006 00 06 2006 35 138 37 53

1997 28 2004 1999 14 1 1 1993 1994 3 2 2 1997 1790 1790 2001 29 11 11 2002 1997 12 12 1990 9 3 3 1977 172 172 1998 2005 1974 1985 20 4 4 1994 22 9 9 1992 1996 4 3 3 2002 2002 52 4 4 2004 4 4 2000 9 2 2 1986 1 World Bank 2000 I y II