Question

In the last paragraph there are many examples of the use of the present perfect (...has helped to increase the export trade,... has occurred not only in the export trade, Foreign companies have been encouraged, Jobs opportunities have been provided..., All these factors have contributed...) This verb tense was used because: *
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Answer 1

Since we don't have the text, we can't help much, but there you go.

Resposta pra sua pergunta:

This verb tense (the present perfect) was used because it indicates that those actions happened in a recent past and it was not mentioned when they occurred or mainly because they happened in the past and still have an effect on the present moment.