The following claim has been attributed to economist Professor Herakles Polemarchakis.

A couple of years ago, there were more Cayennes circulating in Greece than individuals who declared and paid taxes on an annual income of more than €50,000, a figure only slightly above the vehicle’s list price.

The quote seems to come from the Bulletin of the Economics Research Institute, and is available here.

It has since been picked up by many news organisations, such as

However, the figures behind this claim do not seem to be referenced, and seem to be disputed (again, without references). Indeed, in the "comments" section to the linked article, the following is argued:

In Greece there are 160000 taxpayers who have income over 50000 euros per year. This means that according to this article there must be over 160000 Cayennes in Greece. But based on the local Porsche representative in Greece , from 2000 to 2009 only 1560 Cayennes have been sold in Greece! Where are the rest 159000; The numbers on this article are preposterous. Why mr Polemarchakis is telling lies and why now;

Has anyone followed up on the figures behind this claim? Is it true, or is this a slander on Greek society?