1969 essentially wins out of the strength of 4 albums
x2 15/15 albums Arthur and Abbey Road.
x2 14.5/15 album In The Court Of The Crimson King and Let It Bleed
The 2nd best year 1972. Had x2 15/15 Foxtrot and A Woofer In Tweeter's Clothing. However only x1 14.5 album with Roxy Music self-titled debut.
Hence 1969 wins. Even though 1972 outnumbers 1969 in the 14/15 and 13/15 and 12/15 albums.
It's strongly bias my personal opinion of all-time masterwork over quantity of quality