In my day we bought tapes or records. What happens today?

These days you buy downloads and you get played on the radio. http://www.rianz.org.nz/rianz/chart_facts.asp

Information is Beautiful has statistics and a graph.

Shame it doesn't have accurate statistics, though it does have some very pretty graphics. I've calculated some of it's claims based on local sales data and Information is Beautiful is only out by around 1962.8%.