自经济衰退以来，参与食品救济券计划的人数直线飙升（见图表）。
Participation has soared since the recession began (see chart).
下一节解释您现在作为用户能看懂的食品券参与率显示图背后的实现。
The next section documents the implementation behind the food stamp participation display you now understand as a user.
近4000用户参与了试验，并目睹了自己用回收垃圾的三分之一多换取抵用券，可用以得到免费咖啡或者在当地商店中打折。
A trial of almost 4,000 households saw them put out a third more recycled waste in exchange for vouchers to get free cups of coffee and discounts in local shops.
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