will have been declining
-habré estado declinando
Future perfect progressiveconjugation ofdecline.There are other translations for this conjugation.

decline

By that time, the population of the more developed regions will have been declining for 20 years, whereas the population of the less developed regions will still be rising at an annual rate of 0.4 per cent.
Para entonces, la población de las regiones más desarrolladas habrá estado disminuyendo durante 20 años, mientras que la población de las regiones menos desarrolladas continuará todavía aumentando a una tasa anual del 0,4%.
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