我们看到，虽然大学毕业生的周收入也一直在增长，从1975年的80美元增加到了2005年的150美元，但是增幅上远低于高中毕业生。

We see that although the weekly income of college graduates also witnessed a constant increase, from $80 in 1975 to $150 in 2005, the growth margin was far smaller than that of high school graduates.

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