The Official Albums Chart is a list of albums ranked by physical and digital sales and (from March 2015) audio streaming in the United Kingdom. It was published for the first time on 22 July 1956 and is compiled every week by the Official Charts Company (OCC) on Fridays (previously Sundays). It is broadcast on BBC Radio 1 (top 5) and found on the OCC website as a Top 100 or on UKChartsPlus as a Top 200, with positions continuing until all sales have been tracked in data only available to industry insiders. However, even though number 100 was classed as a hit album (as in the case of The Guinness Book of British Hit Albums) in the 1980s until January 1989, since the compilations were removed this definition was changed to Top 75 with follow-up books such as The Virgin Book of British Hit Al