If my math is correct, 1.2 million visas on 35 million admissions is about 4%. That's why we look to the ETA to broaden our ability to screen current visa-exempt travellers who are only first screened essentially by a border services officer when they land at a Canadian airport.
We think the ETA—as the U.S. has found with their ESTA, their electronic system, and the Australian system—screens people and pushes the risk overseas.