The Bank of Korea(BOK) said Friday that North Korea's gross domestic product(GDP) is estimated to have dropped one-point-one percent last year, marking the first time in five years it posted negative growth according to BOK estimates.

The North Korean economy posted minus growth in 2009 and 2010 but it's believed to have since grown in positive territory for four years straight through 2014.

North Korea's nominal gross national income(GNI) last year is tallied at 34-point-five trillion won, or two-point-two percent of South Korea's GNI.

The North's per capita GNI edged up last year to one-point-39 million won but is still only four-and-a-half percent of South Korea's.

Also last year, North Korea's overseas trade volume combining exports and imports of goods plunged nearly 18 percent to six-point-two billion dollars. The figure excludes inter-Korean trade, which rose 15-point-seven percent last year to a little over two-point-seven billion dollars.

The BOK said the statistics are based on estimates as no accurate data is available from North Korea.