The normal figure for in-app purchases is about 5%.

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The media frenzy over Knut boosted visitor numbers to 200, 000 in March - double the zoo's normal figure.

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There has also been an increase in the number of GP consultations for flu but the figure remained "within the levels of normal seasonal flu activity".

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As the figure below shows, the situation has returned to normal, after having been upended during the financial crisis and recession.

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It is certainly a significant figure, but it means little unless it is compared with the cost of care for people of normal weight and for those who are underweight.

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