When the Conservatives re-introduced visas for Mexico, after 9511 claims in 2009, that cut down the number of refugee applicants from about 25% of the total to about 1%. 

Now that the federal Liberals have recently lifted visa requirements, numbers will no doubt  once again increase substantially. The first month after restrictions were lifted saw 70 claimants, compared to  111 in all of 2015.

Here is  an except from an interesting report:  "An internal government regulatory cost analysis released in November 2016 found that lifting the visa requirement for Mexican travellers is expected to cost about $262 million over the next decade, in part to deal with a potential surge in asylum seekers. The report says the overall cost of the policy shift will be $433.5 million over 10 years.

And this BEFORE the recent fear factor of Trump policy, and before Trudeau tweeted out his welcome.