Tried to go for a different author every time, and novels instead of poetry, here goes...
1980: A Confederacy of Dunces, by John Kennedy Toole
1981: Crónica de una muerte anunciada ('Chronicle of a Death Foretold'), by Gabriel García Márquez
1982: The Gunslinger (The Dark Tower 1), by Stephen King
1983: The Colour of Magic (Discworld 1), by Terry Pratchett
1984: Nesnesitelná lehkost bytí ('The Unbearable Lightness of Being'), by Milan Kundera
1985: The Accidental Tourist, by Anne Tyler
1986: Howl's Moving Castle, by Diana Wynne Jones
1987: Beloved, by Toni Morrison
1988: Matilda, by Roald Dahl
1989: The Remains of the Day, by Kazuo Ishiguro