article_snippet.sent: In 1990, immigrants accounted for just 7.9 per cent of U.S. population .
article_snippet.sent: U.S population could grow to 417million by 2016.
article_snippet.sent: In 2010 U.S population was 306million .
article_snippet.sent: Yet there has been almost no national debate about bringing in so many people legally each year, which is the primary factor driving these numbers.'
article_snippet.sent: There are also more than 4.4million people on a U.S. State Department green card waiting list.
article_snippet.sent: (65million) per cent by 2040 and 18.8 per cent (78million)  by 2060.