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.
Postage stamps and postal history of North Korea
The first stamps of North Korea were issued on 12 March 1946: "Rose of Sharon" and "Samson Rock". Stamps prior to 1974 dealt primarily with subjects relating specifically to North Korea, its foundation, Kim Il-sung and other patriotic themes. After 1974, in a bid to bring more hard currency into the country, North Korea began issuing stamps with wide-ranging themes (such as Joan of Arc, airships, sports and wildlife) and using English descriptions.