level, by former US President Clinton. Crystal meth seeping across the border from North Korea has led to a drug problem. According to a Brookings report, "Jilin Province is not only the most important transshipment point for drugs from North Korea into China, but has itself become one of the largest markets in China for amphetamine-type stimulants." Yanji had registered nearly 2100 drug addicts in 2010 compared to just 44 in 1990; local officials admitted that the actual number was possibly five or six times higher. Geography and climate Yanji is situated among foothills, with the main metropolitan area contained in a small, very flat area. It is ringed by mountains dotted with small, remote farming communities. It has a four-season, monsoon-influenced, humid continental climate (classified in the Köppen system as Dwb), with long, very cold winters, and short, but very warm, humid summers. Spring and autumn constitute very short transitions with some, but usually not heavy, rainfall. The monthly 24-hour average temperature ranges from in January to in August, while the annual mean is and a total precipitation of , most of it falling during the summer. Sunshine is generous but falling far short of the central and western parts of Jilin; with monthly percent possible sunshine ranging from 39% in July to 62% in February, there are 2,280 hours of bright sunshine annually. Administrative divisions Yanji has six subdistricts and four towns. Subdistricts: Henan Subdistrict ( / ), Jiangong Subdistrict ( / ), Xinxing Subdistrict ( / ), Gongyuan Subdistrict ( / ), Chaoyang Subdistrict ( / ), Beishan Subdistrict ( / ) Towns: Yilan ( / ), Sandaowan ( / ), Xiaoying ( / ), Chaoyangchuan （) Demographics The Korean diaspora in China has significant populations in at least eleven major Chinese cities, but none larger than Yanji: official Chinese census reports from 1990 placed the city's ethnic Korean population at over 170,000. Official census reports from 2000 have not yet been released publicly, but current estimates place it between about one third of the city's total population to more than one half. Both Chinese and Korean are considered "official languages" of the city: all official signs are in bilingual text. Economy With its current population estimated at four hundred thousand, Yanji is small by Chinese standards (by comparison, the population of Shanghai is almost twenty million). Yanji is also relatively young: the city was developed only