The Canadian Hot 100 was launched on the issue dated March 31, 2007 and was made available for the first time via "Billboard" online services on June 7, 2007, replacing the Canadian Singles Chart. The Canadian Hot 100 emulates the formula that drives the US "Billboard" Hot 100, which has mingled sales and radio data since its launch in 1958. Along with SoundScan's digital sales data, the new chart is driven by BDS' Canada All-Format Airplay, with a panel of more than 100 radio stations. The comprehensive radio panel includes the country's leading top 40, rock, country and adult contemporary stations.