We all know CD sales have fallen like a drunken sorority girl in heels on an ice rink. But this infographic from Digital Music News, with 30 years of data shown in 30 seconds, really hammers the point home.

The data is looking at percentages of total sales. So, for example, although format [x] might have done more in annual sales in a given year, it could still be shown as having a smaller slice of the pie if its market share declined. Click through to see year-by-year stills. [digital music news via Cory O'Brien]