What percent of domestic U.S. retail phonograph record sales for each
of the years 1956, 1957, and 1958  were by singer Pat Boone?  (Along
with Elvis, Boone was the pre-eminent pop recording star in the
business then. It still may well be less than 1%, so please give me
even the decimal fraction.  The raw numbers and sources they come from
will of course be desired.) Does any recording star nowadays enjoy
command of a similar percentage share of retail sales?

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Clarification of Question by mickeybitsko-ga on 07 Apr 2006 19:34 PDT

ANY of the years 1956, 1957, or 1958 verifiably sourced will earn the
fee.  Or all of them a little undersourced.  All of them well sourced
will earn extra tip, promise!