“Water heating makes up anywhere from 15 to 25 percent of the annual energy usage in a home, ” says Steve Koep, a regional sales manager for Marathon water heaters.

“热水系统的花费在年度家用能源消费总量中占了15%到25%。” 斯帝夫·科普（Steve Koep），马拉松热水器地区销售经理。

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This article utilizes the Grey theory to predict the annual power usage of one certain region, based on the power usage data of this region from 1997 to 2007.

本文根据我国某地区1997 ~ 2007年每年用电量数据，运用灰色理论，预测该地区每年的用电量。

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The lack of valid credit card is due to the low rate of revolving credit usage, low commission rate from merchants and annual fee waiver policy;

其中信用卡有效收入不足是由我国信用卡循环信用率偏低、商户佣金费率偏低和各家银行信用卡免年费政策的实施导致的；

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For example, Southwest Airlines hedged as much as 85% of its annual fuel usage over the past six years.

FORBES: Magazine Article

Relative to actual annual consumptive usage, there is already a greater inventory of gold than there is of any other commodity.

FORBES: Bright Gold, Dim Economy

While there is no hard and fast rule, investors should look favorably upon companies that hedge at least 30% of their expected annual fuel usage.

FORBES: Magazine Article