5 A rising share of unauthorized immigrants have lived in the . for at least a decade. About two-thirds (66%) of adults in 2014 had been in the . at least that long , compared with 41% in 2005. A declining share of unauthorized immigrants have lived in the . for less than five years – 14% of adults in 2014, compared with 31% in 2005. In 2014, unauthorized immigrant adults had lived in the . for a median of years, meaning that half had been in the country at least that long. Only 7% of Mexican unauthorized immigrants had been in the . for less than five years in 2014, compared with 22% of those from all other countries.