The Irish Singles Chart is the Republic of Ireland 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).