Did you actually submit your top 20 for consideration?Having had time to consider this, in 1977 alone the albums released superior to Rumours are:
Heroes
Marquee Moon
Exodus
The Clash, their finest album
Peter Gabriel
New Boots and Panties
My Aim is True
In the City
Talking Heads:77
and the album that was released to trash and mock all the blandness such as MOR muzack,
Never Mind the Bollocks