Groceteria.com

With this addition, all ten Canadian provinces are represented on the site. The territories may never be included because there is very little chain activity to begin with and not much data to be found. But enjoy Newfoundland, even if it does only cover 1970-2000 right now:

http://www.groceteria.com/place/canada- ... /st-johns/

Updated to include 1960-61 and 1966.