A drought in northern China is shaping up to be the longest since 1951, matching one in the winter of 1970-71. This will affect world food prices as adverse weather has also affected Russia, Australia and Argentina, which are major food producers. China has large reserves of grain and has the foreign exchage reserves to import wheat. China's wheat imports rose to 1.2 million tons in 2010, according to Global Trade Information Services. This compares with global output of 682 million metric tons of wheat in 2009, as estimated by the UN Food and Agriculture Organization. Because China accounts for one sixth of global wheat production, this will put pressure on wheat prices. The Chinese government has cushioned price rises by asking provinces and cities to raise the minimum wage, which went up by 18% a year in Guangdong province.