19.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.
20.与大学毕业生相比，硕士毕业生的增长幅度要稍微好一些，分别出现了1985-1995年间约50美元及1995-2005年间约75美元的增长。
Compared with college graduates, the increase margin of master degree graduates faired slightly better and we saw an increase by about $50 during1985-1995 and around $75 during 1995-2005.
