Analysis of information sources in references of the Wikipedia article "UK Albums Chart" in English language version.
1989 "the Official Albums Chart is split in two: a Top 150 Artist Albums Chart and a Top 50 Multi-Artist Compilations Chart. In time, the two charts become widely referred to (including within the OfficialCharts.com database) as the "Official Albums Chart" and "Official Compilations Chart. Format shifts continue through the year – sales of CDs overtake vinyl albums for the first time, as BPI data registers a then albums market peak of 163 million units across the year".