There has been a progressive decrease in population every year in this city.

这个城市的人口在逐年递减。

《新英汉大辞典》

And the fall of social average rates is the basic reason of the progressive decrease of the currency circulation speed.

而社会平均利润率的下降是货币流通速度递减的根本性原因。

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At the typical environment, the tree growth may basically follow the regulation of progressive decrease with the increased age .

在典型的取样环境中，树木生长多遵循缓慢递减的规律，作生长量订正时，可采用传统的树木年轮学订正方法。

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There is a progressive decrease in their caloric intake.

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In a progressive tax system, that also means that the amount of tax payable will be smaller since tax rates tend to decrease with taxable income (with some exceptions, of course).

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