1982:
Iron Maiden - The Number of the Beast
Other great albums from that year: (just from a skim through RYM)
Michael Jackson - Thriller
Judas Priest - Screaming for Vengeance
Accept - Restless & Wild
Scorpions - Blackout
Peter Gabriel - Security
Rush - Signals
Venom - Black Metal
Y&T - Black Tiger (Thought Bosk might appreciate this one)
Genesis - Three Sides Live
Asia - Asia