The long-term trend has been downwards.

长期趋势呈下降态势。

youdao

There have been peaks and troughs in the long-term trend of unemployment.

长期以来失业率一直时起时伏。

《牛津词典》

So the decline may be part of a long-term trend.

所以这一下降数字可能只是长期发展趋势的一部分。

youdao

And what a boom it would be to get back to the long-term trend!

FORBES: Expect Two Recessions Before End Of Decade

Since the mid-1970s the long-term trend in household saving has been downwards (see chart above).

ECONOMIST: The sorry state of saving

But the long-term trend is clear: We will need more and more skilled people.

FORBES: Fact And Comment