[3] The positions of all songs are based on week-end sale totals, from Sunday to Saturday,[4] but pre-1987 the charts were released on a Tuesday because of the need for manual calculation.
[5] Since inception there have been more than 1,400 number ones; of these, instrumental tracks have topped the chart on 30 occasions for a total of 96 weeks.
Calvert's track "O Mein Papa" stayed at the top of the charts for nine weeks, longer than any other instrumental single.
The single "Cherry Pink (and Apple Blossom White)" has been an instrumental number one for two different artists (Calvert and Perez Prado) in 1955.
To date, Martin Garrix is the most recent artist to have an instrumental number one, with "Animals" in November 2013.