I was born in '63, so this era was a bit ahead of my time, but the window between '70 and '78 is hard to top. In just the first 6 months of '70, for example, these were released:
Back in the USA - MC5
Bridge over Troubled Water - Simon & Garfunkel
Chicago - Chicago
American Woman - The Guess Who
Argent - Argent
Hello, I'm Johnny Cash - Johnny Cash
Black Sabbath - Black Sabbath
Moondance - Van Morrison
Leon Russell - Leon Russell
Morrison Hotel - The Doors
Sweet Baby James - James Taylor
Deja Vu - Crosby, Stills, Nash & Young
Band of Gypsys - Jimi Hendrix
The Isaac Hayes Movement - Isaac Hayes
On tour with Eric Clapton - Delaney & Bonnie
Elton John - Elton John
McCartney - Paul McCartney
Bitches Brew - Miles Davis
Eric Burdon Declares WAR - Eric Burdon & War
Live Cream - Cream
ABC - The Jackson 5
Let it Be - The Beatles
In the Wake of Poseidon - King Crimson
Live at Leeds - The Who
Self Portrait - Bob Dylan
Workingman's Dead - The Grateful Dead
Ecology - Rare Earth
Fire and Water - Free
Gasoline Alley - Rod Stewart
Runt - Todd Rundgren
So, uh, yeah, I'll just take this 6 month window over the entirety of your 90's era list.
And frankly, this might not have been the best half of '70....