总体来说，在美国公立大学中，如今学生及其家庭所付的学杂费已占到了学校总收入的36%，而这个数字在1983年还只是24%。

Over all, tuition and fees paid by students and their families now account for about 36 percent of all educational revenue at public institutions in the United States, up from 24 percent in 1983.

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这个家庭的年总收入是8000元。

The total annual income of this family is 8000 yuan.

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2007年，在医疗机构分娩的自费医疗费用相当于低收入家庭年均家庭总收入的13%。

In 2007, out-of-pocket expenditure on a facility-based delivery equalled 13% of the mean annual household income for low-income households.

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