When applying Article 52(1)(b)(i) for the purpose of calculating
of earnings for the credited period under Finnish legislation on earnings-related pensions, where an individual has pension insurance
periods based on activity as an employed or self-employed person in another Member State for part of the reference
period under Finnish legislation, the earnings for the credited
period shall be equivalent to the sum of earnings obtained during the part of the reference
period in Finland divided by the number of months for which there were insurance
period ...[+++]s in Finland during the reference period.