#TAX/GDP is tax collected divided by the GDP, both from the CIA world factbook.  I realize that there are problems measuring tax (e.g. whether state & local tax included).
@The USA is the reference country for Unit Currency Cost US$.  Percentage changes are from the average during 1993 to the rates on 8 Oct  2000 (from YAHOO).  e.g. it now costs only US$73 to buy the same number of Marks that would have cost US$100 in 1993.
* Germany & France are now fixed to the EURO

What is noticeable is:

The odd man out is the UK, probably explained by the fact that the UK is an oil producing country.

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