Funny that you should mention that song. Nationally, it wasn't all that big a record--if memory serves, it peaked at #31 or #30 in 1982. More importantly, as shown by the ARSA surveys (which you now have to create an account to view), there were a lot of radio stations, especially stations in areas that had very small African-american populations, that never played the song at all and you could only hear it on "American Top 40," if your market (and most markets did) carried that program.
For example, in Los Angeles, where I was attending college at the time, KIQQ-FM, KFI, and KRLA all played the song regularly. On the other hand in Phoenix, where my family had moved a decade earlier (and which is still my home), neither of the two top-40 stations, KOPA nor KZZP, played that one in regular rotation.