The UK Albums Chart is a weekly record chart based on album sales from Friday to Thursday in the United Kingdom (the chart week ran from Sunday to Saturday until 2015). It listed only physical album sales until 2007, after which it has also included albums sold digitally, and from March 2015, includes streamed tracks. The chart is currently compiled by the Official Charts Company (OCC) on behalf of the UK music industry, and each week's new number one is first announced on Friday evenings (Sunday evenings until July 2015) by BBC Radio 1 on their weekly chart show.