How many copies have been sold of each of the following books?
[Alternatively, how much sales revenue has been generated by each of
the following books?]

1. Black Holes, Wormholes & Time Machines
by Jim Al-Khalili (Institute of Physics Publishing 1999)

2. The Physics of Star Trek
by Lawrence Krauss (Harper Paperbacks 1996)

3. In Search of the Edge of Time: Black Holes, White Holes, Wormholes
by John Gribbin (Penguin Books, reissued 1999)
[a.k.a Unveiling the Edge of Time (Harmony 1992, Three Rivers Press 1994)] 

4. Black Holes and Time Warps: Einstein's Outrageous Legacy
by Kip Thorne (W.W. Norton & Company 1994)

5. Lorentzian Wormholes: From Einstein to Hawking
by Matt Visser (American Institute of Physics Press 1996)