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While the predicate noun is plural, the subject, “export,” is singular, so it needs a singular verb.

Some intransitive verbs require a predicate noun or pronoun in the nominative case, or an adjective, to complete their meaning.

Note 3.—The verb to be is followed by the nominative case, as in Mn.E.; but when the predicate noun is plural, and the subject a neuter pronoun in the singular, the verb agrees in number with the predicate noun.

Do not use a when or where clause as a predicate noun.

A verb should agree in number with the subject, not with a predicate noun.