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 and compiled on behalf of the IRMA by Chart-Track. 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 stores and over forty independents submit data for the charts, accounting for over 80% of the market, according to Chart-Track. 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.