Hardly. I've seen anywhere from 1/4 to 1/3 at the most.
Current estimates are that we have 11-12 million illegals. It has been almost twenty yrs since Reagan's amnesty. Hence, about 550-600,000 Illegals get in each year. We detain and deport 1.2 Million per yr. Thus, if 1.8 million try and 1.2 are caught about a third make it.
These are rough estimates but seem to be close to reality.