Assertion: ac chart | /r/HasProperty | based on radio airplay
Facets:
value: by this time
type: TEMPORAL
value: entirely
type: DEGREE
Source sentences:
text: By the early 1990s, automatic song detection and barcode sales information had begun to be the norm for most of the Billboard charts, although by this time the AC chart was based entirely on radio airplay and no longer incorporated retail sales reports.