Can you provide statistics detailing the prevalent types of
automobiles in the United States by make, model, and year.

This what you are looking for ??

http://www.econstats.com/wauto_a.htm

I'm Looking more specific and current information on what are the most
prevelant automobile models (not manufactures)in use in the US. ie
{12.5% camry, 12.2% impala, 12.1% civic, etc.}

DETROIT, July 1, 2004; Reuters reported a list of the 
U.S.top-20 selling vehicles, ranked by total units.

  1 Ford F-Series pickup        432,969  402,072       1   +7.7
  2 Chevy Silverado-C/K pickup  322,907  321,992       2   +0.3
  3 Dodge Ram pickup            218,369  218,301       5   +0.0
  4 Toyota Camry                197,798  184,848       4   +7.0
  5 Honda Accord                192,106  193,876       3   -0.9
  6 Ford Explorer               168,059  179,341       6   -6.3
  7 Toyota Corolla/Matrix       167,894  171,062       9   -1.9
  8 Honda Civic                 162,483  153,009       8   +6.2
  9 Ford Taurus                 144,035  170,393       7  -15.5
 10 Chevrolet Impala            139,460  133,948      13   +4.1
 11 Dodge Caravan               131,367  133,411      19   -1.5
 12 Chevrolet TrailBlazer       122,832  124,780      14   -1.6
 13 Ford Focus                  118,807  122,095      15   -2.7
 14 Nissan Altima               116,699  100,685      12  +15.9
 15 Chevrolet Cavalier          103,918  128,346      11  -19.0
 16 Ford Escape                  98,532   78,768     N/A  +25.1
 17 GMC Sierra pickup            98,370   91,510      17   +7.5
 18 Jeep Grand Cherokee          95,118   89,728      18   +6.0
 19 Ford Econoline               92,118   85,561     N/A   +7.7
 20 Chevrolet Tahoe              89,089   88,794      13   +0.3

This is about as recent as it gets

Production rates only give a snap shot of what currently is being
produced and does not show what was produced and what is no longer in
use. I'm looking for are most prevalant automobile models in use in
the US.