Bizarrely, the UK is the world's largest legal exporter. (Canada is second.) The managing director of the exporter, British Sugar, is married to the government's drugs minister. It's very cosy.
The Canadian government started publishing the production and export numbers for licences medical producers at the end of 2017 [0]. Looks like the total amount exported is a few hundred kilograms of dried canabis and a few dozen liters of cannabis oil per month.