The OCC produces its charts by gathering and combining sales data from retailers, who it claims cover 99% of the singles market and 95% of the album market, and aims to collect data from any retailer who sells more than 100 chart items per week.
The OCC produces its charts by. The OCC is gathering and combining sales data from retailers. The OCC aims to collect data from any retailer. This retailer sells more than 100 chart items per week. It claims cover 99% of the singles market. It claims cover 95% of the album market retailers.