According to Bloomberg:
North Korea’s trade with China expanded more than 60 percent to $5.63 billion in 2011 [...]
Commerce with China accounted for 70.1 percent of the North’s total $8 billion trade in 2011, up from 57 percent in the previous year, South Korea’s national statistics office, Statistics Korea, said in its annual report today in Seoul. North Korea does not report economic data. Inter-Korean trade amounted to about $1.71 billion in the same year.
Excluding a dip in 2009, trade between the two countries has increased every year since the start of 2000, when the statistics bureau started releasing estimates. Data for 2012 will be released around the end of next year.
North Korea’s economy expanded 0.8 percent in 2011 and gross national income per capita was 1.33 million won ($1,239), nearly one nineteenth that of South Korea’s 25 million won, according to the Bank of Korea. South Korea’s total nominal gross national income was 38.2 times that of the North’s 32.44 trillion won.
The regime imported 3.8 million barrels of crude oil for 2011. Power generation capacity was 6.9 million kilowatts, less than one-10th that of South Korea. Steel production was 1.23 million tons and production of chemical fertilizer production was 471,000 tons.
North Korea’s population rose to 24.3 million in 2011 from 24.2 million the previous year — about half of South Korea’s. Population estimates were based on North Korea’s 1993 and 2008 censuses.
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N. Korea’s 2011 China Trade Grew More Than 60 Percent