The per capita income gap between the two Koreas widened to over 21 fold last year.

According to estimates on North Korea's economic growth last year released Friday by the Bank of Korea, the North's nominal per capita gross national income (GNI) stood at one-point-38 million won, or about one-thousand 200 dollars, last year.

During the same period, South Koreans made on average 29-point-seven million won, or 21-point-four times more than income of North Koreans.

The Bank of Korea attributed the widened income gap to a drop in North Korea's overall exports including a 17 percent plunge in its mineral shipments.

The North's real gross domestic product (GDP), however, rose one percent in 2014 from a year ago.

The North Korean economy has also expanded for the fourth year since 2011 after contracting in 2009 and 2010.