Transferring funds can be done in various ways including electronic funds transfers. It can be done through cash smuggling. It may be through the exchange of goods. It may be through an informal mechanism whereby you give the money to a relative here in Canada who knows somebody abroad and then the money is never transferred but there's a promise that the money will be transferred. Basically, terrorists as well as money launderers use all of the methods available to them. Quantifying one method over another would be very difficult to do.
On March 24th, 2015. See this statement in context.