But it won't take long for the nature of that comparison to change.

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However, this year the BBC will measure 2013 change in seats by comparison with the last election, 2009, when most of these councils were elected (thus ignoring subsequent by-election changes and councillor defections).

BBC: Q&A: Election results 2013

Deutsche Bank produced poor returns in 2001, although a move to American accounting and a change in German tax laws fogs comparison.

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Asked if climate change had been over-emphasised in comparison with population growth, Mr Fox agreed.

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Armed with photographs and records from the original expedition, Schaller and a group of graduate students conducted comparison studies to look for signs of climate change.

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That may be too high, but the comparison provides a rough estimate of the order of change in fiscal integration required to deliver any meaningful impact.

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This means it only measures the change in the price of properties that have been sold before, to ensure a proper comparison.

BBC: House price surveys explained

The Registry's price index is calculated by measuring only the change in the price of properties that have been sold before, to ensure a proper comparison.

BBC: House price surveys explained

In four clicks on an iPad it's possible to change the screen from a view of a world map to a graph of toothpaste prices in India and a sales comparison that shows local brands are gaining share.

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