From the KEXP home page (http://www.kexp.org) I found that this year's top 90.3 is a listener poll. Thus, I suppose that the previous years' top 90.3 (including the top 90.3 of the 90's which is not on the KEXP website anymore) were also listener polls. I will therefore remove these lists from my database unless anyone has other information.
THE KEXP TOP 90.3 ALWAYS DO A LISTENERS POLL, WHICH FOR THIS YEAR IS NOT YET OUT. BUT THERE ARE THE DJ'S
TOP 10, WHICH I CALCULATED INTO A LIST ON ITSELF :