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We welcome comments, criticisms, and further information. Please send correspondence by email in English to Keith Dexter at keith dot dexter29 at btinternet dot com, or in Russian to Ivan Rodionov at or

Conventional communications may be mailed to the authors, care of:

Professor Mark Harrison
Department of Economics
University of Warwick
Coventry CV4 7AL, England


Curious? Click on the image to enlarge it. For the underlying data, go to the current dataset.

Version 19 has been geocoded by Veli-Pekka Kivimäki.