The Irish Singles Chart (Irish: Cairt Singil na hÉireann) is Ireland's music industry standard singles popularity chart issued weekly by the Irish Recorded Music Association (IRMA) and compiled on their behalf by The Official Charts Company. Chart rankings are based on sales, which are compiled through over-the-counter retail data captured electronically each day from retailers' EPOS systems. Currently, all major record shops, digital retailers and streaming services contribute to the chart, accounting for over 95% of the market. A new chart is compiled and officially released to the public by the Irish Recorded Music Association on Friday at noon. Each chart is dated with the "week-ending" date of the previous Thursday (i.e., the day before issue). The singles chart was first published on 1 October 1962, and covered the top ten singles of the previous week by record label shipments.