The problem with any "period-of-time" is that you know full well that Vicente Fox and his fellow elites would scream if they believed these people would ever return to their homeland. Fox isn't satisfied that one out of five of the citizens of Mexico are living here now --- he fully intends to get a whole lot more out. Nothing is changing or improving in Mexico -- and the crime there is skyrocketing out of control --- something else Fox chooses to ignore.
Well .. that's a separate issue and since I don't know anything about what Fox wants or doesn't want .. I will not argue with you.
I was discussing the wording of the document - that's all.