Economy of North Korea
Estimating gross national product in North Korea is a difficult task because of a dearth of economic data and the problem of choosing an appropriate rate of exchange for the North Korean won, the nonconvertible North Korean currency. The South Korean government's estimate placed North Korea's GNP in 1991 at US$22.9 billion, or US$1,038 per capita. In contrast, South Korea posted US$237.9 billion of GNP and a per capita income of US$5,569 in 1991. North Korea's GNP in 1991 showed a 5.2% decline from 1989, and preliminary indications were that the decline would continue. South Korea's GNP, by contrast, expanded by 9.3% and 8.4%, respectively, in 1990 and 1991.
Korean currency
After the division of Korea, North Korea continued using the Korean yen for 2 years until the Central Bank of the Democratic People's Republic of Korea was established on December 6, 1947 and a new currency was issued. It was at the time pegged at par to the Soviet ruble. It was revalued at a rate of one hundred to one in February 1959 and new won were issued.