It's any year in the decade, depending on when in the hour you're listening, and there are a few songs that even go as far back as (gasp) 1979, such as Pat Benatar's "Heartbreaker", which started getting CHR airplay at the end of that year, peaking in early 1980. And, of course, the first two hits by Blondie actually peaked in 1979, although 90%+ of listeners think "Heart Of Glass" and "One Way Or Another" were released in 1980.
You actually got me wondering what the current percentages of the library are per year, so I did some quick calculations ... years determined by when the song peaked, 1980 includes that handful of songs from 1979, and 1989 includes a few songs that started in that year but peaked in 1990:
- 1980 - 4%
- 1981 - 6%
- 1982 - 10%
- 1983 - 15%
- 1984 - 14%
- 1985 - 13%
- 1986 - 10%
- 1987 - 9%
- 1988 - 9%
- 1989 - 9%
(Yes, I know that only adds up to 99%, because I rounded to whole numbers.)
I should also add that there are more songs from 1980 and 1981 in my hourly "Forgotten 45s" feature's library than there are in the main library; I only considered the latter when calculating percentages. And the above numbers also do not include the titles in the library for the Saturday night "classic New Wave" block.