Since 2000 Christmas spending has grown by five per cent per year on average, according to the firm.

该公司称，自2000年以来，圣诞消费每年呈5%的速度增长。

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During that time, local sea levels have risen by 120 millimetres, or 2 millimetres per year on average.

在那段时间里，当地的海平面上升了120毫米，或平均每年上升2毫米。

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By 2050, the global population is projected to rise to 9 billion, so average per head emissions will have to be lower than 2 tonnes per year on average.

到2050年，全球人口预计将达到90亿，因此，人均排放量必须降到平均每年2吨以下。

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The government has also submitted legislation that would increase the excise tax on beer by an average of 50 percent per year from 2010 to 2012.

VOA: standard.2009.10.15

For instance, that you can rely on the stock market returning 10% to 12% per year on average.

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Following Jim Collins' OTC Insight model portfolios since 1988 would have given you a return of more than 20% per year on average.

FORBES: Jim Collins: Sweet Spot Growth Stocks

There have been 5 earthquakes of 9.0 or larger, since 1952 and an eathquake over 8.0 happens once per year on average, according to Wikipedia.

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