This whole story however does point out the need for an overhaul of the charts system, as leaving out digital download data can skew the numbers dramatically.

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Researchers do not know if these weaknesses skew the data towards, or away, from finding effects.

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Numbers for March are seen as a true indicator for the sector, as the Chinese New Year holidays skew the data in January and February.

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Moscow, and Moscow oblast, obviously skew the data quite a bit.

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Professor Siegel counters this assertion by noting that the 10-year look-back contains a skew in earnings data associated with the financial sector during the sub-prime mortgage crisis.

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Stephen Walters, chief economist at JP Morgan, said there was some "static" in the data with volatility in high density housing data in New South Wales helping to skew the result, but added it was still clear that a downtrend is underway in housing.

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