1951   RETRO Farmer in the Sky by Robert A. Heinlein..................18
1953   The Demolished Man by Alfred Bester..................19
1954 RETRO Fahrenheit 451 by Ray Bradbury..................14
1954 RETRO Fahrenheit 451 by Ray Bradbury..................14
1955   They'd Rather Be Right by Mark Clifton and Frank Riley..................13
1956   Double Star by Robert A. Heinlein..................19
1958   The Big Time by Fritz Leiber..................19
1959   A Case of Conscience by James Blish..................17
1960   Starship Troopers by Robert A. Heinlein..................15
1962   Stranger in a Strange Land by Robert A. Heinlein..................18
1963   The Man in the High Castle by Philip K. Dick ..................14
1964   Way Station by Clifford D. Simak ..................24
1965   The Wanderer by Fritz Leiber..................14
1966   (tie) Dune by Frank Herbert..................23
1966   (tie) This Immortal by Roger Zelazny..................21
1969   Stand on Zanzibar by John Brunner ..................16
1970   The Left Hand of Darkness by Ursula K. Le Guin..................18
1971   Ringworld by Larry Niven..................20
1972   To Your Scattered Bodies Go by Philip José Farmer..................16
1973   The Gods Themselves by Isaac Asimov..................22
1974   Rendezvous with Rama by Arthur C. Clarke..................21
1975   The Dispossessed by Ursula K. Le Guin..................25
1976   The Forever War by Joe Haldeman..................21
1977   Where Late the Sweet Birds Sang by Kate Wilhelm..................19
1978   Gateway by Frederik Pohl ..................20
1979   Dreamsnake by Vonda N. McIntyre ..................25
1980   The Fountains of Paradise by Arthur C. Clarke..................22
1981   The Snow Queen by Joan D. Vinge..................24
1982   Downbelow Station by C. J. Cherryh..................18
1983   Foundation's Edge by Isaac Asimov..................20
1984   Startide Rising by David Brin..................24
1985   Neuromancer by William Gibson..................24
1986   Ender's Game by Orson Scott Card..................22
1987   Speaker for the Dead by Orson Scott Card..................20
1988   The Uplift War by David Brin..................24
1989   Cyteen by C. J. Cherryh..................25
1990   Hyperion by Dan Simmons..................20
1991   The Vor Game by Lois McMaster Bujold..................18
1992   Barrayar by Lois McMaster Bujold..................20
1993   (tie) A Fire Upon the Deep by Vernor Vinge..................25 
1993   (tie) Doomsday Book by Connie Willis..................23 
1994   Green Mars by Kim Stanley Robinson..................25
1995   Mirror Dance by Lois McMaster Bujold..................21
1996   The Diamond Age by Neal Stephenson..................21
1997   Blue Mars by Kim Stanley Robinson..................23
1998   Forever Peace by Joe Haldeman..................24
1999   To Say Nothing of the Dog by Connie Willis..................23
2000   A Deepness in the Sky by Vernor Vinge..................22
2001   Harry Potter and the Goblet of Fire by J. K. Rowling..................18
2002   American Gods by Neil Gaiman
2003   Hominids by Robert J. Sawyer..................16
2004   Paladin of Souls by Lois McMaster Bujold..................17
2005   Jonathan Strange & Mr Norrell by Susanna Clarke
2006   Spin by Robert Charles Wilson
2007   Rainbows End by Vernor Vinge..................19
2008   The Yiddish Policemen's Union by Michael Chabon..................18
2009   The Graveyard Book by Neil Gaiman..................14
2010   (tie) The Windup Girl  by Paolo Bacigalupi 
2010   (tie) The City & the City by China Miéville 
2011   Blackout/All Clear by Connie Willis
2012   Among Others by Jo Walton
2013 Redshirts by John Scalzi
2013 Redshirts by John Scalzi