[dì jiǎn]
（一次比一次减少） decrease progressively [successively]; decrease by degrees; reduce progressively
a decrease of budget
预算递减
The demand for tea is on the decrease (each year).
茶叶的需求量（逐年）递减。
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。