had been witnessing
-había estado presenciando
Past perfect progressiveconjugation ofwitness. There are other translations for this conjugation.

witness

Many LDCs had been witnessing a decline in the share of services in their GDP since the 1990s.
Muchos PMA habían experimentado desde el decenio de 1990 una disminución de la parte correspondiente a los servicios de su PIB.
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