The music must be Canadian content. There is a way to determine whether the content is Canadian, but I will not get into the details since I don't have the information with me. Once the content is labelled as Canadian, we search the Nielsen SoundScan data. Actually, we always use the same databases. We extract the information and we identify all the sales by Canadian artists from all the sales in Canada. We are then able to calculate and see what the number was previously and what it is now.
On March 4th, 2014. See this statement in context.