Who actually records the sales of various novels - starting with the best sellers down to the average sellers in YA, Sci-Fi, or Occult, etc., etc., etc! Is there a way to access this data? Do any SDopers have experience doing this? If so, do I have the option to search by author as well as by title? Last, are sales tracked annually, or what? Perhaps after sales drop below a certain level in a year, then it is no longer tracked?
Any other ways/resources/free databases available to access such comprehensive demographics on book sales?