That makes it accurate to call the vast majority of illegal aliens criminals.
http://pewhispanic.org/files/factsheets/19.pdf
This is from the Pew Research Center so I hardly think that it is suspect.
The rest of the unauthorized migrant population, somewhat more than half, entered the country illegally.Some evaded customs and immigration inspectors at ports of entry by hiding in vehicles such as cargo trucks.Others trekked through the Arizona desert, waded across the Rio Grande or otherwise eluded the U.S. Border Patrol which has jurisdiction over all the land areas away from the ports of entry on the borders with Mexico and Canada.