By DAMIEN CAVE
Published: July 6, 2011
In simple terms, Mexican families are smaller than they had once been. The pool of likely migrants is shrinking. Despite the dominance of the Roman Catholic Church in Mexico, birth control efforts have pushed down the fertility rate to about 2 children per woman from 6.8 in 1970, according to government figures. So while Mexico added about one million new potential job seekers annually in the 1990s, since 2007 that figure has fallen to an average of 800,000, according to government birth records. By 2030, it is expected to drop to 300,000.
source: The New York Times